Wireless doorbell suddenly missing motion

My doorbell had been working great. Now, suddenly, it’s missing motions like crazy. My W2 was stolen and it missed the motion completely. The mailman was seen and recorded, but not the theft. The mailman was recorded delivering today, but the Amazon delivery wasn’t recorded at all (three large boxes, so how can that be missed?). I’ve strengthened the sensitivity, even though it never missed anything before (had it two years now), and I added even more areas to monitor motion. But it misses even more and more. Do I have to buy a new one every other year, or what?