Pass, I have always held a pet theory that ANY BB kit is always worth powering off once a month or so, just to remind all the kit involved what it is supposed to be doing !
Left to its own devices, my old 8128 service would wander down to about 5meg, with no apparent loss of sync (yes I know this ain't poss). A reboot once every couple of weeks cured it. Still do the same with my FTTC service.