PVR Splitting Recordings

Why is my PVR splitting up my shows into multiple recordings?! It is making watching my recordings very jarring and annoying! For example, Grey’s Anatomy is 1 hour- my PVR is recording the show in two 30 minute recordings. The worst part is that I am literally missing stuff that is happening during the split. Please help!
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This can happen if your PVR reboots or loses connection while recording. Have you noticed any issues with TV signal being lost while watching live TV or do you seem to lose internet connectivity randomly? Could be a bad PVR, could be an issue with wiring to the modem, could be a problem with the internet service.