You'll only brick the board if you remove the media the BIOS file is on whilst it is flashing or the power goes out. It takes a couple of seconds to do and I bet it will help to solve your issue. Get your motherboard manual and read up on how to do it. then do it.No. I know I should but I am honestly scared to because I have a fear of something freezing up and then the motherboard is dead...
You've done stuff far riskier than flashing the BIOS in the past - running your PC on a crappy PSU for 2 years, for example.