1) The lamp(s) flicker(s) slightly.
It's not unusual that the TL lamps flicker slightly. If this is really getting worse, you can have the appliance examined. We advise you to take your appliance to your dealer or a Philips service center.
2) The lamp(s) goe(es) off and on repeatedly.
The appliance needs to be examined to determine the cause of the problem and the best solution. We advise you to take the appliance to your dealer or a Philips service centre.