Change filament issue

#1
So today I had a print that was about 12 hours into the print and had to do a filament change. I went into the menu and selected change filament and it took a few seconds and then when to the change position and unloaded the filament, then the message changed and said heating it was heating the head. well it had a display showing 200/201 and never progressed past the heating head. I waited at least ten minutes and as much as I hated to do it restarted the machine and started my 24 hour print over.... not a happy camper right now.

anyone have any ideas why it would do this? and is there a fix?