mirka deros 65020 problem. i wonder if other deros owners have same issue?

[jcpsmallwoodworkershop]

i bought a mirka deros 65020, and i find it is a nice unit but i have the following problem.
the deros shuts down at 10000 rpm. anyone else have this problem?
the deros shut down at 10000rpm occurs sometimes with plan sanding pad, but
it really triggers when i add the pad saver 1/4 inch spacer and then a sanding pad.
without pad saver, it runs fine at 10000 rpm.

anyone experience this?

i own festool ro 150, ro 90, ets 150 and ets 125 and the ras and have never seen
a sander shut down when there is a wooble, which is what the deros appears to be
doing, at 10000rpm with the pad saver, the wobble is more pronounced, i can start
at 4000 rpm and sneak up to 7000 rpm and the wobble grows at higher speed until
it shuts itself.

thanks