16 consecutive T3 timeouts

Good morning

For the last 2 years on and off I sometimes get 16 consecutive T3 timeouts which cause the Internet to go off for about 45 seconds then comes back on again. My power levels are fine and I have a Hub 5 and have my own router. The issue has never gone away and virgin have no idea what causes the issue from reading other posts on here. Never had this issue when I was on a Hub 3. The problem is on the 3.1 upstream channel. 

I'm actually thinking about giving BRSK a go when my contact ends next June.