The video file might have been too large. The new iPhones have very high res videos so they can be tricky to post. Sounds like neurological problems of some sort. Could you post photos of your set up and let us know the basics, like what size reptile tank you have, which
UVB light you're using, etc. I recommend Reptisun 10.0 UVB T5 HO (high output). What is the temperature in your basking zone and your cool side? Do you have a digital reptile thermometer with a probe end to make sure your temps are accurate?
From reading other posts, I've seen situations where beardies developed neurological problems due to issues such as inner ear infections, parasites that affect absorption of nutrients, dehydration, and even certain viruses. Sometimes, bearded dragons can get intestinal blockages called impaction, which also can present with some neurological issues. If you describe your set up and care (feeding, water,
bathing, etc.,) it may be easier to narrow down potential causes.