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.
3) The lamps probably flicker because you are using an extension cord.
Connect the appliance without an extension cord and check if the lamps stop flickering.
4) The ventilation openings were probably obstructed.
Remove the object that is obstructing the vents and switch the appliance back on. Then check if the solarium works properly again.