Software version 20.29 - HRM not working and can't connect to wifi

I've been having issues with my 955 reading a low heart rate for the first seven minutes of my run so updated up the latest version of the software.  Since then my watch HRM doesn't work (checked it is on in the settings, did a reset of the watch) and when I try to connect to the wifi on my watch it tells me I can't because I have a low battery even though it is at 98%.  Any advice on how to get my 955 back to being a useful sports watch?