I get this problem on the odd occassion on my CH setup. Since it has only recently started, I put it down to my hat switch sticking but I am beginning to wonder! - It can happen on different views, and since each has it's own switch within the hat, the sticking switch idea now seems unlikely. I found that going to the "stuck" view again will release it.
By "stuck" I mean to say it is as if the default view has been changed. So if it got stuck on the rear right quarter, I can view everywhere else, but on releasing the hat it would go back to the rear right quarter. I think I cycle the "stuck" view a couple of times rather than once to unstick it and get the forward view back on releasing the hat.
As far as I can recall, it also only seems to occur when I am scanning my views extremely quickly.
This has only started to happen in the last month or so and fortunately fairly rare, e.g. a hour or two on line last night and I don't recall a single instance of it happening.
All in all, a repeat of what others have observed although I haven't tried using the Esc (map) key!