I have got a problem with 6.15. 411GL with R52Hn and R52n-M every 30 minutes or 1 hour just suddenly stopped.
Then i plugged off and back, working 30 minutes or maximum 1 hour.
I have got another 411GL and 6.15 running smoothly.
try stronger power supply - more ampers.
I tried with 24 V 0.38 A, at the moment working for 10 hours with 12V 0.5A, but very interested this kind of problem because before 6.15 everything worked fine.The problem is the same, i tried with 3 different 12 and 24 V power supply.
Nobody met this kind of problem ?