Hi folks, I've run into a major issue trying to cut 1/2" mdf with a Festool Carvex 420. After about 8-10 inches of cut, the blade starts to burn, gets bent, goes of track, and becomes uncontrollable. I've ruined 4 blades so far. I have tried all settings from the fastest to slowest, least agressive cut, nothing matters. The blades are fairly thick with wide gullets. I've used this saw on maple and plywood without any issue, cuts straight and leaves a fine finish. This is the first time I've tried to cut mdf with a jigsaw. Can you tell me what the problem is? Many thanks, Len.