Just started today. Was able to let it automatic repair and boot up. Was on for like 10 hours, shut down and tried to boot up some hours later. Now its completely stuck on automatic repair. Have unplugged all additional hdd's and then all unnesscarry USB's. Still doing this. Also removed my ethernet card. Still the same.
I cannot lose my data. I have several SSD's and HDD's with important files across several of them.
If Windows 10 fails to load enough times, it should offer to boot you into safe mode, however, it sounds like you might actually have a failing drive: I'd recommend cloning the drive ASAP to attempt data recovery (don't do anything else to the drive until you clone it). After that, you can try a repair, but if you have a failing drive it's best to stop using it after you get your data.
Good luck, I hope this helps!