Raft question

I've been printing for awhile now and printed with a raft for the first time a week or so ago. I thought I'd discovered the secret to printing and wondered why I hadn't tried it sooner. I printed a geared bearing with a raft, peeled the raft off and it spun easily. In the past the squished first layer always messed me up, with the raft, the raft gets squished wider and the bearing printed fine. The light was lit and all was good. Then something changed. I don't know what happened, but the parts won't separate from the raft anymore. Any ideas as to why this might be happening? I need to switch back to my orange filament and see if that's what changed. The parts in red, black blue and natural all stick to the raft and I can't peel it away. Any help on this subject would be most appreciated.

Thanks,

TiM