There's no TimeOut facility with Shiftin. I have some doubt on your hardware at first but, if you could use the same setup in a 'normal' environement (let's say on your own bench) and confirm that the problem is still the same, we can probably dig deeper in your stuff.

I see some strange stuff so far... seems to have some missing PAUSE or something, some pins a set Low/High twice, those While/Wend are obscure... If you coulld post your schematic, it could help. Datasheet link, for lazy user like me, could be handy.