Framework Module has been tampered with - Calendar controlled Page groups fail

I have had several times in the last few weeks where my scheduled pages don't play as scheduled, and when I log in to FreePBX UI the system tells me that there is a problem with my Framework Module and the solution is to download and force reinstall, which fixes it for a while until it stops working again and the same thing happens. The effect of Framework being disabled removes the Paging Pro scheduling options. If/when it happens again I will try to update with more details. I haven't touched the Framework module!