Unable to connect to WiFi network

## Description
After weeks of using elementaryOS successfully, all of a sudden it became impossible to connect to my home's WiFi network. As a desperate move, I reinstalled elementaryOS, and everything went back to a working state... Until a few days later, I find myself again unable to connect wirelessly to the Internet. The network is correctly identified by the settings panel, but connection attempts never get anywhere.

## Platform information
- OS: elementary OS 5.1.7 Hera
- Device: Microsoft's Surface Pro 3

## Additional context
Partial output of `sudo lshw -C network`:
```
description: Wireless interface
product: 88W8897 [AVASTAR] 802.11ac Wireless
vendor: Marvell Technology Group Ltd.
...
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless
configuration: broadcast=yes driver=mwifiex_pcie latency=0 multicast=yes wireless=IEEE 802.11
...
```