Stress is something that happens over time so frequent handling, plus other husbandry issue are likely what led to this issue, at this size it can also take something as big as an adult mouse so offering a small mouse is too small.
Looks like you have a few issues, provide a smaller setup, proper temps 24/26 on the cool side 30/32.5 on the hot side, feed the adequate size prey, stop handling every day and everything will get back to normal.