Here recently I have noticed that the pads are not sticking like they used to on my Flex 3401. I took the same pads that wasnt attaching to the 3401 and threw it on my PE14 and it was on there nice and secure. Do the backing plates get worn out and eventually need replaced every so often? I have had it for about 2 years and detail as a side job so it gets a good amount of use. Anybody else have this problem?