Pico Enviro+ suddenly stopped connecting to WIFI

Hi there,
I set up a pico enviro+ a while ago and it was working just fine connecting to an mqtt server over WIFI. However, it suddenly stopped connecting to the WIFI and I started getting the following error from Thonny:
Traceback (most recent call last):
File “”, line 101, in
File “uasyncio/core.py”, line 1, in run_until_complete
File “uasyncio/core.py”, line 1, in run_until_complete
File “uasyncio/core.py”, line 1, in run_until_complete
File “network_manager.py”, line 86, in client
File “network_manager.py”, line 66, in _handle_error
RuntimeError: WIFI Client Failed

I’ve been running one of the code examples from the pimoroni github for the enviro+.

Could you please help with this?

Many thanks