Figure out log notify timeout bug

Bad bug timing out every 90s from subscription channel when connected over lotus ws:// api. Very generic golang network connection timeout -- seems unrelated to lotus or xchain. Looks like the socket is getting disconnected at lower level?

Could be ubuntu OS
No good knowledge in slack threads.

Strategies
1. try on macos
2. run boost see if it has same problem as it also does this subscription
3. Try running lotus not on localhost but on some other server
4. see if this happens on non lotus eth apis
5. all else fails debug deep into network stack