When I suspend Minecraft into a panel or put my computer to sleep, it's most likely that the game will freeze when I try to resume it.
The last time I put my PC to sleep and then when I woke it up, the game window was open under another app, but the game didn't respond. Other times, when I suspend Minecraft into the panel, it stops responding after while. Simply the icon on the panel does not open the game window.
I think this error occurs randomly or after some random time.
Of course, when this problem occurs I lose the game progress.
Thank you for your report!
We're tracking this issue in MCPE-135350, so this ticket is being resolved and linked as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
If you haven't already, you might like to make use of the search feature to see if the issue has already been mentioned.
Quick Links:
📓 Bug Tracker Guidelines – 💬 Community Support – 📧 Mojang Support
📓 Project Summary – ✍️ Feedback and Suggestions – 📖 Game Wiki