Windows 10 app freezes PC then crashes when hosting a multi-player game

Open Windows 10 app OK and start playing a world - OK

Other on local WAN log in - OK

About 5 mins later they are disconnected and the WIN 10 PC is refusing all input (however animations are seen in Minecraft - like torches flickering) then a few mins later the Win 10 app crashes completely and the PC can be used again.

I repeated this on two different PCs running windows (same version of both)

This has not happened until the latest update 1.5.3 - worked flawlessly since the start of the Win 10 Bedrock editions.