HG633 Wifi connection drops often

Hi,
I am having serious issues with my router HG633 as the wifi connection drops very often. If I connect using ethernet cable, everything works fine. But Wifi rarely works for 10 mins before it gets interuppted. The software version is v1.15t. Is there an firmware upgrade which fixes this issue please. I read that there is a v1.18 being pushed out, but my router has not been updated yet.