Jay
It is 100% update issue because my battery meter was working fine before , after applying the update the phone restarts and then i canāt see my battery percentage, this is thing happens just after the update.
I also reported the problem to the support team -That was my first step, they said please visit service centre , went to there , the guy at service centre refused o even look at my phone because it was out of warranty. Now just waiting for next and hoping is only last resort