I am having a power problem with this unit. On powering up the tv will go on for about a second then switch itself off - it then powers back up anf the tv works fine. The unit may actually go through this routine 2 - 3 times before switching on properly. Have any other owners of the GA5E series had any problems like this. The tv never switches off once it is on and seems to works perfectly. Any opinions from users would be great.