Recently inherited a iPhone 4S that had been in long term storage (battery was at 0).
Was very conservative in charging and noticed that it would boot loop. First thought due to bad battery but after checking device info with 3uTools noticed that it was Jailbroken.
Have been doing Internet searches how to fix this boot loop problem.
Did a forum search but got No results found for 'jailbreak boot loops'.
Hope someone seeing this has some suggestions!