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Is this PMX or PME?
The only experience I have had that is somewhat similar but not the same was guiding PE would suddenly go bad for a few seconds wrecking the image.
SB sent me a new worm and that fixed it. In the process of changing it over it seemed there was a possibility of some gunk from the belt in the pulley. I forget the period for the worm - I think its something like 4 minutes. So if there were some junk on your pulley it would cause a big spike in PE repeating around every 4 minutes. This is what I experienced.
Also with the 3 way switch have you have the dreaded gear slip with a badly unbalanced mount? If you forget to turn it to lock it can slip and grind. The gears seem pretty tough but if you had a heavy scope it potentially could cause damage.
There have been other posts of elusive tracking/guiding problems that ended up being a disconnected lead etc. So its not necessarily stright forward. But there does seem to be a lot of these posts about guiding/tracking issues with SB mounts. They need to raise their QC game or they'll end up like Nikon!!
Greg.
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