Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Screen not bright first 15 minutes

I bought the Lowrance iway 500c. Worked great in the house. Next morning, screen was too dark to read for 15 minutes, then display became normally bright. Did this every morning for 4 days. Lowrance replaced the unit, but the new one did exactly the same thing. Called Lowrance, who said they're having a problem with this they should fix by "this spring". I returned the unit for refund.Lowrance suggested I keep it in the house overnight. Who wants to detach the unit at night and re-attach it in the morning? (If you don't forget.)If you're in a warm climate, can sit and wait 15 minutes on cold mornings for it to work or get one that doesn't have this problem, it's great. I consider this to be a major design flaw.I bought a Garmin 2610 to replace it and love the functionality, although I'd love a little bit larger screen.