Shotgunpete,
Sounds like Google to me, ha.
But to answer your question, no I have not seen similar problems with our sites.
Seems like there is something about your site Google doesn’t like or is struggling with when it is crawled. Do you feel your website is structured cleanly, i.e. pages, links, coding, urls, etc.? Is your site new or have you had it for a few years?
New sites can bounce around a lot and if you have any issues with the nuts and bolts of the website itself can cause difficulties for the Google Bots.