YOUTUBE requires new login each time.

If the box is set to fast start or active start and not switched off at the plug or with the switch on the back of the box you shouldn't have a problem.

The 360 has recently received an update to 5.2. If you have tried a power off and on again reboot and that hasn't helped then you could try a factory reset using the keep recordings option.

It's only a partial system reset and not a complete factory reset. You are given 2 options,

Keep Recordings

Format Disk

Choose Keep Recordings, that means you won't lose your recordings and any planned recordings or series links you've set up, you will have to sign into your apps such as iPlayer, Prime, Netflix and ITV-X again, also Match frame rate and Standby power consumption will go back to their default settings if you have changed them.

Hello Cathie-Tony

Sorry t hear of the frustration caused by the YouTube app asking for a login each time. We appreciate you raising this via the forums.

Have you been able to check the settings as per roy247's post? When you login, is there an option to 'remember me' for future sign ins?

We decided to do nothing and wait to see if things improved.  In the end - after a few days of having to log in each time - the system remembered who we were and logged us in automatically.  Access has been restored to the way it was before these problems arose.  We are closing this issue - for the time being, at least.