Just letting you know Frank that this issue has now fixed itself....for me at least.
11 days ago I was prompted to install a huge update to Android on my tablet, which I did. I was surprised to see that the version remains the same after the installation (6.0.1).
Checking my apps I can see that Android System Webview is not listed. After 11 days it has not reappeared. And the good news is that RUI app has been running perfectly on the tablet via wifi non-stop ever since.
I also just want to say how much I appreciate the time and effort you and your Rune developer mates put in. Many thanks for giving us this wonderful tool.
[Rune 0.4 Beta / Rasbperry Pi 3 / Pi 7" touch screen / HiFi Digi+ Pro / Optical / Schiit Bifrost MB]