After screen wakes up, the background is shrunk

One of our screens is using Win10, and I have scheduled a monitor off/on each day, but every morning the background picture is shrunk to maybe 75%. All the other parts are in the correct position.

If I reboot, or restart the player it is okay.

I have tried using a 1080 and 720 layouts, but there was no difference. None of these match the actual resolution, and there isn’t an option for custom.

I noticed it mentions using a jpg file, but png is working fine apart from this problem. Could that be the cause, or is there a known problem with it? I may have to schedule a reboot each day to get round it.