Loosing Internet connection

Only on your stb or other peripherals too(pc, tab,)?
Ring the provider

yes tooth... in that case try resetting the router, (sometimes it needs to be unplugged to fully resset itself)
then restart all peripherals so as to adjust to the new IP. ( your STBs probably have dns updaters set up)
Which is another thing ¿ is your dnydns account running up to date? check it..