I have a SunDrop XR-U that is acting strangely. When I turned it on this evening, it cycled through all 3 levels and then stopped on low. I thought that it might be an indication of a low battery, so I put in a fresh CR123. Whe I turned it on it came on low and gradually built up to high. It is not repeatable at this time. This is the first time I have had to change he battery, so I do not know if this is a normal occurrence or if there is a problem with the light.Any insight is appreciated.