should i change providers.

steve_2012

i am currently with talktalk essentials and paying around £25 per mth.
i have unlimited call day/night and there broadband 40gig download allowance per mth with some speed boost that is free, occasionally (when family are in cyprus) i add the international bolt on for £3 per mth.
i get speeds of between 12.5 and 9 megs although of late ive been having to reboot as the speed had dropped to 1s and 2s for no apparent reason, it could well be time for a new router.
there is a ps3 and 3 laptops on the go fairly often.
im fairly sure we are on LLU .
i have been with TT for a couple of years and to be fair the service when i did a few problems wasnt bad but most were dealt with via there open forums which was very useful, they even changed my broadband setting a few times over the course of 2 weeks, i cant remember what it was called but it was something to do with SN and DB settings.
should i be thinking of changing providers or just looking to TT for a new deal, would any new TT deal include a new router.
if i went to BT would this be LLU (i dont really know what LLU is).
just looking for a bit of advice before going researching the finer details.
thanks.......

steve.............