hm, that sounds strange - normally LED's should last for years.
The average lifetime for a LED is 100000hours - about 11,5 years continues on.
The lifetime will be reduced dramatically if the LED get to hot - no problem here in Germany or if the current is to high - that's why I recommend to dim them down (see my settings above) - my KPA runs a few hours every day since the end of last year - all LED's are fine.
Perhaps the LEDs are of Chinese origin. Their failure rate and QC for electronic parts is pathetic.
NOTE: I'm NOT accusing Kemper of anything here...just thinking out loud...sometimes when you source parts the country of origin is unknown.