Pampos,
You aren't the only one with this problem. I have experienced it on a couple cutting pads (5.5" LC CCS) with the
UDM. I have posted about it before but have never gotten a good answer. My only theory is that the pads are caving in due to the added heat from the UDM's power. Unfortunately, I haven't had the opportunity to try other pads with it but I would suggest spending the extra money and trying out the UDM DAS pads that David designed specifically for the machine and its added power. Though there are many rave reviews of LC's CCS pads, I have found some them to fall apart after just one car... Good luck!
-Frank