I'm getting a hard time by figuring out why the performace of 2 of my compac F sticks drops constantly from 100% to 90% or 67% after it reached - if it could even reach - 100% at all. Than the target performace of 450 MHz drops down to 440 as well and so on..

I researched all related topics and read this forum but found no solution to my issue. I tried various targets such as 420, 450, 500 MHz with the same outcome. I've put the sticks in different ports of the usb hub but nothing has changed.

Cooling can't be an issue nor the USB Hub since it's a gekko one with a 120W PS. I'm running cgminer's current version (4.12.0) on a 8GB raspi, so I have no clue.
The other sticks are running smoothly on every frequencies only the mentioned 2 are messy.

I'm starting cgminer with the following line: sudo cgminer [...] --gekko-compacf-freq 450 --gekko-start-freq 300 --gekko-mine2 --gekko-tune2 85

The 0: and the 3: are the problematic ones.

 0: GSF 1005xxx2: BM1397:01+ 450.00MHz T:450 P:415 (28:14) | 93.6% WU: 92% | 215.7G / 218.1Gh/s WU:3046.5/m
 1: GSF 1005xxxx: BM1397:01+ 450.00MHz T:450 P:429 (28:14) |  100% WU:100% | 364.4G / 268.7Gh/s WU:3753.8/m
 2: GSF 1005xxxx: BM1397:01+ 450.00MHz T:450 P:448 (28:14) |  100% WU:100% | 285.2G / 284.2Gh/s WU:3970.9/m
 3: GSF 1005xxx3: BM1397:01+ 450.00MHz T:450 P:324 (28:14) | 74.1% WU: 80% | 204.1G / 189.4Gh/s WU:2646.0/m
 4: GSF 1005xxxx: BM1397:01+ 450.00MHz T:450 P:449 (28:14) |  100% WU:100% | 240.3G / 250.5Gh/s WU:3499.3/m

message:
0: GSF 0 - 222.99GH/s low [302.40/241.92/674] reset limit 450.00MHz -> 440.00MHz
3: GSF 3 - 171.92GH/s low [302.40/241.92/507] reset limit 450.00MHz -> 440.00MHz

 0: GSF 1005xxx2: BM1397:01+ 440.00MHz T:440 P:270 (29:15) | 78.4% WU: 86% | 220.4G / 197.6Gh/s WU:2759.8/m
 1: GSF 1005xxxx: BM1397:01+ 450.00MHz T:450 P:450 (28:14) |  100% WU:100% | 211.6G / 288.6Gh/s WU:4031.3/m
 2: GSF 1005xxxx: BM1397:01+ 450.00MHz T:450 P:450 (28:14) |  100% WU:100% | 325.5G / 286.1Gh/s WU:3997.2/m
 3: GSF 1005xxx3: BM1397:01+ 440.00MHz T:440 P:358 (29:15) | 91.6% WU: 87% | 274.1G / 201.6Gh/s WU:2816.1/m
 4: GSF 1005xxxx: BM1397:01+ 450.00MHz T:450 P:445 (28:14) |  100% WU:100% | 249.6G / 272.4Gh/s WU:3806.0/m

message:
0: GSF 0 - 185.22GH/s low [295.68/236.54/577] reset limit 440.00MHz -> 430.00MHz
3: GSF 3 - 211.21GH/s low [295.68/236.54/643] reset limit 440.00MHz -> 430.00MHz

 0: GSF 1005xxx2: BM1397:01+ 430.00MHz T:430 P:398 (29:15) |  100% WU: 91% | 224.0G / 204.6Gh/s WU:2857.9/m
 1: GSF 1005xxxx: BM1397:01+ 450.00MHz T:450 P:450 (28:14) |  100% WU:100% | 348.9G / 294.6Gh/s WU:4117.0/m
 2: GSF 1005xxxx: BM1397:01+ 450.00MHz T:450 P:450 (28:14) |  100% WU:100% | 302.8G / 284.4Gh/s WU:3973.6/m
 3: GSF 1005xxx3: BM1397:01+ 430.00MHz T:430 P:396 (29:15) |  100% WU:^91% | 192.2G / 205.1Gh/s WU:2866.4/m
 4: GSF 1005xxxx: BM1397:01+ 450.00MHz T:450 P:445 (28:14) |  100% WU:100% | 275.3G / 271.8Gh/s WU:3797.7/m

...and so on..

3: GSF 3 - 226.06GH/s low [288.96/231.17/712] reset limit 430.00MHz -> 420.00MHz

3: GSF 3 - 226.06GH/s low [288.96/231.17/712] reset limit 420.00MHz -> 410.00MHz

 0: GSF 1005xxx2: BM1397:01+ 430.00MHz T:430 P:398 (29:15) |  100% WU: 97% | 317.1G / 219.1Gh/s WU:3061.3/m
 1: GSF 1005xxxx: BM1397:01+ 450.00MHz T:450 P:450 (28:14) |  100% WU:100% | 317.5G / 296.0Gh/s WU:4134.5/m
 2: GSF 1005xxxx: BM1397:01+ 450.00MHz T:450 P:450 (28:14) |  100% WU:100% | 309.8G / 289.7Gh/s WU:4047.1/m
 3: GSF 1005xxx3: BM1397:01+ 300.00MHz T:410 P:283 (42:21) | 95.5% WU:100% | 177.9G / 206.2Gh/s WU:2880.6/m
 4: GSF 1005xxxx: BM1397:01+ 450.00MHz T:450 P:445 (28:14) |  100% WU:100% | 249.8G / 271.9Gh/s WU:3799.2/m

aaand reset again

3: GSF 3 - 149.56GH/s low [201.60/161.28/401] reset limit 300.00MHz -> 290.00MHz

3: is worse than the 0:

Am I doing something wrong, or did I forget to setup something or is something with the sticks wrong?
They are all brand new from bitshopper.


Thank you for any ideas and helping me:)


P.s.: And as an addition 4.12.0 cgminer doesn't recognise my blockerupter at all (I used --enable-icarus when I installed cg)