No reasons have given other than differing interests between Wackerman the band.
However the band doesn't seem to saddened by Wakerman's departure as when talking about the possible replacement Rob Brunner, Jr the band stated
"We're all completely blown away with his drumming skills, musical talent and extremely positive attitude... This has rejuvenated us musically and breathed new life into Suicidal. We feel this is the best thing that could happen to the band."