I just installed two 24" IKEA OMLOPP lighting bars under my kitchen cupboards. When I plug either one into the transformer individually they work fine. When I plug both of the lights into the transformer the lights start flashing off and on.
Lighting – Why do the under-cabinet lights flash when two sets are plugged into the transformer
lighting
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As I don't know the interns of this dimmer it might switch when the alternating voltage (and therefore the current with resistive loads) crosses zero. To detect the phase (crossing 0V will occur at 0° 180° and 360° which is again 0° - you might want to look it up here: http://en.wikipedia.org/wiki/Phase_(waves) ) and the type of load (e.g. inductive loads delay the flow of current depending on their inductance and the frequency in relation to the voltage. I could not find a text on wikipedia describing that so here's a plain image: http://people.sinclair.edu/nickreeder/eet155/PageArt/phaseInductor.gif
To detect the type of load it has to observe the mains line for a short period of time without regulating it.
The issue does not occur on light loads because most dimmers can handle inductive, capacitive and resistive loads quite well on low power levels.
By letting the dimmer "cool down" you may erase its short term memory so it has to resynchronize every time you switch it on.
Again: As the internals of this dimmer (or better: the two) are not known I can't provide a better answer. A newer hardware revision usually improves the product. Also chinese manufacturers tend to produce lower quality products as seen here: http://hackaday.com/2012/08/15/buying-cheaper-electronics-and-not-saving-money/
It sounds like you may need to replace the ballast. They do age and eventually do need to be replaced, though not nearly as frequently as the tubes themselves.
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Best Answer
Per IKEA, the 24" OMLOPP LED bar draws 7.7W of power. A single 10W transformer will not be enough to provide power to two 24" bars at full brightness, despite the included transformer having slots for multiple bars to be attached. You will need one of the larger ANSLUTA transformers (seemingly also available in 30W form) or to chain multiple transformers together (also permitted per IKEA).
In fact, it is noted in the reviews that the included 10W transformer, being unable to power two 7.7W bars, will induce a strobing effect if you exceed the rated power. Presumably, the 10W transformer can provide enough power for multiple smaller bars and is simply the transformer included with all products in that line.