Internet signal

Since receiving my alarm other day my internet signal keeps dropping off so have to get up and reboot the modem-which is a pain in the behind. This will happen several times a day whether the alarm is being used or not. I would blame my internet provider usually but this is too much of a coincidence for me to ignore because beforehand the service was **always** 100% perfect. Im in UK-Virgin Media is my provider and there are no faults reported.