Do those problems occur only in foo_out_wasapi v3.0 beta 1 and/or 2? If so, please report them to the thread from which you downloaded the plugin(s).
Betas solve the issue for the current Foobar release, but other audio problems that may not be related suddenly cropped up, so for my system testing purposes I reverted to v1.1.10 w/foo_out_wasapi v2.1 because I know it is stable for me.
I'm going to track that issue down and see if running current Foobar w/foo_out_wasapi v3.0 beta 1 and/or 2 is part of the problem or not. If I can determine it is, I'll report it in the wasapi plug in thread.