This used to happen to me as well. This might sound weird but what works for me is once I realize I’m lucid and the dream starts falling apart as you describe

This used to happen to me as well. This might sound weird but what works for me is once I realize I’m lucid and the dream starts falling apart as you describe it - I quickly start spinning my (dream) body counter clockwise. In most cases this stops the awakening and I can continue lucid dreaming. Waking up in the ”time loop” is also recurring to me, but a reality check often gets me back on track even when I’m pretty certain that I’m awake (I’m not). I usually just look at my hand. If my fingers look spooky, I’m still sleeping and can induce lucid again.