HX Stomp randombly booting up with a white screen

My HX Stomp started booting up showing a white screen instead of the startup screen, then nothing ever shows on the screen.

However, the stomp works fine in the background even thouh I don't see anything. Sound works, switches and buttons work.

When it happens, I reboot a few times until it boots up normally.

Is this a known issue? Should I be worried?

About my setup: the HX stomp is in a rack, powered by a Truetone CS12 with 2 adapters (as suggested everywhere, working perfectly for a few years now).

Thank you for your help and suggestions.