I use a HomeHub (just says Model A on the back) looks like this Google image link:
We are both connected via cat 5 cable to the router, with two tablets and two mobiles on WIFI. The internet is reasonably fast 45-55Mbps when we are on the 76 tier. However the router will enter multiple reboot fits, where it will reboot (turn orange) then blue, and no more than 2-5minutes later will do it again. This will happen multiple times at generally in the evening. After a number of reboots it will settle and work fine till the next time.
Try quiet line test dial 17070 option 2 should be silent and best with corded phone using test socket
Post stats advanced setting then technical log information