Hi...this is my 3rd time ordering the large solar brick lights. . . . the first time (1.5 yrs ago) I ordered 6 of them..love them and still in perfect working order. Then more recently I placed two further orders for these same solar brick lights. The 2nd order was for 10 lights . . and the 3rd order was for an additional 13 lights. Out of all the 29 I have ordered to date, 3 of them appear to be a little faulty. All the other 26 work great, light up all night and I am really happy with them. The other 3 however do not seem to last very long . . they only light up for a few hours and go off again, while all the others stay alight all night long. All the lights are in the same area, receiving the same amount of day light without any shade so I can only assume these 3 are faulty? Due to the weight of these solar bricks it would cost me more than they are worth to post them back. I;m slighlty disappointed that these 3 arent working correctly but I am pleased with the other 26 that do work fantastically and in general I am very please with the companies service and delivery!