SenseHAT is loosing connection after some hours of use

Which node are you reporting an issue on?

node-red-node-pi-sense-hat

What are the steps to reproduce?

This is the flow, I'm using on my Raspberry Pi 3B+ with Raspbian:

[{"id":"7aa7407d.550d1","type":"rpi-sensehat in","z":"1841b51e.41772b","name":"","motion":true,"env":true,"stick":true,"x":100,"y":180,"wires":[["710370a0.d3b5b"]]},{"id":"710370a0.d3b5b","type":"switch","z":"1841b51e.41772b","name":"Sensor Data","property":"topic","propertyType":"msg","rules":[{"t":"eq","v":"motion","vt":"str"},{"t":"eq","v":"environment","vt":"str"},{"t":"eq","v":"joystick","vt":"str"},{"t":"else"}],"checkall":"false","repair":false,"outputs":4,"x":290,"y":180,"wires":[[],["8d241a12.f97968","460b6c21.49edf4","867dbce7.b4506"],[],[]],"outputLabels":["motion","environment","joystick","otherwise"]},{"id":"8d241a12.f97968","type":"change","z":"1841b51e.41772b","name":"get temperatur","rules":[{"t":"set","p":"payload","pt":"msg","to":"payload.temperature","tot":"msg"}],"action":"","property":"","from":"","to":"","reg":false,"x":600,"y":160,"wires":[["ef8e416e.62cf2"]]},{"id":"460b6c21.49edf4","type":"change","z":"1841b51e.41772b","name":"get humidity","rules":[{"t":"set","p":"payload","pt":"msg","to":"payload.humidity","tot":"msg"}],"action":"","property":"","from":"","to":"","reg":false,"x":590,"y":200,"wires":[["7a0053a.62998ac"]]},{"id":"867dbce7.b4506","type":"change","z":"1841b51e.41772b","name":"get pressure","rules":[{"t":"set","p":"payload","pt":"msg","to":"payload.pressure","tot":"msg"}],"action":"","property":"","from":"","to":"","reg":false,"x":590,"y":240,"wires":[["4390be22.0dd39"]]},{"id":"ef8e416e.62cf2","type":"change","z":"1841b51e.41772b","name":"Save Temperature","rules":[{"t":"set","p":"state.temperature","pt":"global","to":"payload","tot":"msg"}],"action":"","property":"","from":"","to":"","reg":false,"x":810,"y":160,"wires":[["2a916557.19be3a"]]},{"id":"7a0053a.62998ac","type":"change","z":"1841b51e.41772b","name":"Save Humidity","rules":[{"t":"set","p":"state.humidity","pt":"global","to":"payload","tot":"msg"}],"action":"","property":"","from":"","to":"","reg":false,"x":800,"y":200,"wires":[["56291be6.023ea4"]]},{"id":"4390be22.0dd39","type":"change","z":"1841b51e.41772b","name":"Save Pressure","rules":[{"t":"set","p":"state.pressure","pt":"global","to":"payload","tot":"msg"}],"action":"","property":"","from":"","to":"","reg":false,"x":800,"y":240,"wires":[["a539d3c1.409ac"]]},{"id":"2a916557.19be3a","type":"ui_gauge","z":"1841b51e.41772b","name":"Show Temperature","group":"5664af2f.e29e5","order":1,"width":"6","height":"4","gtype":"gage","title":"Temperature","label":"°C","format":"{{value}}","min":"0","max":"50","colors":["#0092b5","#00b500","#ca3838"],"seg1":"10","seg2":"30","x":1210,"y":160,"wires":[]},{"id":"56291be6.023ea4","type":"ui_gauge","z":"1841b51e.41772b","name":"Show Humidity","group":"5664af2f.e29e5","order":2,"width":"3","height":"3","gtype":"wave","title":"Humidity","label":"%RH","format":"{{value}}","min":"0","max":"100","colors":["#0092b5","#00b500","#ca3838"],"seg1":"10","seg2":"30","x":1200,"y":200,"wires":[]},{"id":"a539d3c1.409ac","type":"change","z":"1841b51e.41772b","name":"Ceil","rules":[{"t":"set","p":"payload","pt":"msg","to":"$ceil(payload)\t","tot":"jsonata"}],"action":"","property":"","from":"","to":"","reg":false,"x":1030,"y":240,"wires":[["d34d30af.841b1"]]},{"id":"d34d30af.841b1","type":"ui_gauge","z":"1841b51e.41772b","name":"Show Pressure","group":"5664af2f.e29e5","order":2,"width":"3","height":"3","gtype":"wave","title":"Pressure","label":"hPa","format":"{{value}}","min":"970","max":"1050","colors":["#0092b5","#00b500","#ca3838"],"seg1":"1000","seg2":"1050","x":1200,"y":240,"wires":[]},{"id":"5664af2f.e29e5","type":"ui_group","z":"","name":"Comfort","tab":"9cb4eb1e.6f02b8","order":1,"disp":true,"width":"6","collapse":false},{"id":"9cb4eb1e.6f02b8","type":"ui_tab","z":"","name":"Sensors","icon":"fa-thermometer-empty","order":3}]

What happens?

Sometimes after one or two days, the cennection to SenseHAT gets lost.

The Node-RED-Log shows this outuput:

pam_unix(sudo:session): session closed for user root
      pi : TTY=unknown ; PWD=/home/pi ; USER=root ; COMMAND=/usr/bin/python -u /home/pi/.node-red/node_modules/node-red-node-pi-sense-hat/sensehat.py
pam_unix(sudo:session): session opened for user root by (uid=0)
pam_unix(sudo:session): session closed for user root
      pi : TTY=unknown ; PWD=/home/pi ; USER=root ; COMMAND=/usr/bin/python -u /home/pi/.node-red/node_modules/node-red-node-pi-sense-hat/sensehat.py
pam_unix(sudo:session): session opened for user root by (uid=0)
pam_unix(sudo:session): session closed for user root
      pi : TTY=unknown ; PWD=/home/pi ; USER=root ; COMMAND=/usr/bin/python -u /home/pi/.node-red/node_modules/node-red-node-pi-sense-hat/sensehat.py
pam_unix(sudo:session): session opened for user root by (uid=0)
pam_unix(sudo:session): session closed for user root
      pi : TTY=unknown ; PWD=/home/pi ; USER=root ; COMMAND=/usr/bin/python -u /home/pi/.node-red/node_modules/node-red-node-pi-sense-hat/sensehat.py
pam_unix(sudo:session): session opened for user root by (uid=0)
pam_unix(sudo:session): session closed for user root
      pi : TTY=unknown ; PWD=/home/pi ; USER=root ; COMMAND=/usr/bin/python -u /home/pi/.node-red/node_modules/node-red-node-pi-sense-hat/sensehat.py
pam_unix(sudo:session): session opened for user root by (uid=0)

What do you expect to happen?

Even after loosing connection the script should reconnect automatically.

Please tell us about your environment:

• Node-RED version: 0.18.7
• node.js version: 10.5.0
• npm version:6.1.0
• Platform/OS: Raspbian
• Browser: Chromium

Start with the node-red-node-pi-sense-hat package and its sensehat.py entry point, using the supplied long-running Raspberry Pi flow to reproduce the loss of connection. Trace the repeated sudo sessions in the Node-RED log and determine how the process handles disconnection. Done means the SenseHAT connection is restored automatically after it is lost.