Did someone come up with a reasonable workaround for this? I’m having this issue on 4.15 it’s driving me absolutely bonkers 
But a temporary “fix” that eases the annoyance for me is to launch “New Window (PIE)” and then shut it by hitting the Stop button on the bar when the issue crops up. This will save you from those horrid restarts (I mean actually clicking the GUI button and NOT stopping by pressing Esc). Lemme know if it works for y’all.