Problem with device or Minecraft itself?

Hi, I am playing Bedrock edition on an admittedly very old and tired Amazon tablet and keep having issues accessing my realm.

Issues generally start with the ‘unable to access realms’ screen and/or a Guardian error code, which is usually fixable by signing out and back in to the microsoft account. However, it has now started blocking me from signing back in with a Creeper error code, necessitating restarting the whole device at least three times before it clears up.

I play a lot of Minecraft so this is basically rinse and repeat upwards of twice a day.

All this to say, I’m not the most technologically literate person, does this sound like a problem with the game, the Microsoft account or the device itself?

Any and all advice welcome!