Ive just bought this uv lamp as I use IBD gel and they advise that you use their lamp, and if you not using their lamp to cure it for twice the amount of time (which will take forever). I had it for about 4 weeks and bought it brand new, but it doesn't always seem to cure especially at the edge of the nails near nail wall. the thumbs take twice as long as they should even though I cure thumbs separately and the uv top coat is taking 2 and half mins to cure and it should cure in 1 min. It had brand new bulbs with it and I have cleaned any gel that has stuck to side walls off and regularly cleaned bulbs. Any ideas why this lamp is doing this?