Diablo 1/2 in. Dia. x 2-5/8 in. L Carbide Top Bearing Flush Trim Router Bit

I bought one of these bits a couple of months ago. At first, I LOVED it! cut like butter, followed the pattern well. Beautiful results. And then after about 10 times using it, suddenly it jumped all over the place and ruined my work and WORSE chewed up my expensive pattern. The set screw holding the bearing had fallen out causing the bearing to wobble. I assumed this must be a fluke and returned it and got a replacement. About 5 uses later, SAME STORY. I returned THAT one and got a replacement. If this one fails again, I will NEVER EVER touch a diablo bit again. As it is, I will only RELUCTANTLY use a Diablo router bit.