yes there was switching, lyra2re2, equihash, neoscrypt.. (see log below)
(I tried all miners standalone and no problem with 102% power)
from the log:
Status: Running
Speed Active Launched Command
----- ------ -------- -------
395,79 MH/s 00 Days 01 Hours 30 Minutes 3 Times Bin\Excavator\excavator.exe -p 23456 -c
MiningPoolHub_Lyra2RE2_2_Nvidia.json -na
Status: Idle
Speed Active Launched Command
----- ------ -------- -------
0,00 PH/s 00 Days 00 Hours 09 Minutes Once Bin\NVIDIA-Palgin\ccminer.exe -a lyra2v2 -o
stratum+tcp://hub.miningpoolhub.com:17018 -u miner2speed.ku1 -p x
0,00 PH/s 00 Days 00 Hours 13 Minutes Once Bin\Excavator\excavator.exe -p 3456 -c MiningPoolHub_Equihash_3.json
0,00 PH/s 00 Days 00 Hours 09 Minutes Once Bin\Excavator\excavator.exe -p 23456 -c
MiningPoolHub_Equihash_2_Nvidia.json -na
You are switching between miners so it's not the same as running one miner.
Just note that MultiPoolMiner cannot crash the operating system.
It's most likely power spikes and/or miner parameters.
Get rid of Equihash_3 and any others with 3 threads as they are too intense. Even try 1 thread instead of 2 or 3.