just got the fenix rc40 and tried it out last night, it ran for about 1-2 min then would shut up... i can pull the battery out and re install it and it will come on again for 1-2 min... i can do that repeatedly but it won't stay on longer that that.... it was about 45-50 degrees, but if it won't work in that temp range i need to send it back.... and tips/info/tricks i need to know? thanks