since installing the latest recalbox (pulsar) on Raspberry Pi 4 when exiting a game (hotkey & start) it sends a signal to my LCD TV to restart somehow. connected via HDMI,
it's not the end of the world but very strange & takes longer to get to the menu obviously.
Does this in the different cores i've tried (neo geo, mame, megadrive) so seems to not be the core but maybe emulation station or recalbox sending a signal to the tv.

Im using a HDD been all fine beofre, but trying a different theme from the menue, when rebooting it hangs on the loading screen (almost complete) I have tried a few times & left for well over an hour.
booting without the HDD starts up.

recalbox seems a bit buggy, as i previously had it so it would do a full check of all roms etc everytime (taking 10 mins every boot).
I wiped the HDD & started from scratch but just as I was getting it just how I wanted this happens.
is there a way to edit the theme change perhaps to get it to boot again?

did you use the installer from this website? Id recommend that & get the one for the right version of Pi you have.
Try a different micro SD card to make sure its not that too.
try a different install of OS from the installer, to test the PI is working too.