hi have upgraded to fibre broadband a few months ago and if i have 2 or more devices in use at the same time the wifi seems to freeze.
Have run a speed test and am getting 39mbs.
Also noticed that if i am watching netflix/amazone/youtube etc which is connected via lan cable it buffers alot when the wifi drops out.
Have factory reset router(hg633) and changed the wifi channel but still the same.
Borrowed a hg633 router offf a friend andt hat was the same.
This is the reason i changed from normal broadband to fibre as ive been having this issue for months.
All my devices are up to date. windows 10 pc,iphone xr,samsung s9 and samsung a70.
At times its so bad with the wifi i switch to mobile data just to finish off what im doing online.