Only problem, we go

DIS / reconnects seem to be a contact problem. After I got the part completely dismantled times so unscrewed also board and screwed together again without the screws on the board so extremely strong draw as they were previously, ensured that the panel not on the foam rubber presses (plate as far as pure as it gets, possibly the screws. the front cover slightly loosen then it proceeds in) was recognized it promptly and no dis / reconnects more, now it is also the supposedly problematic accessories I previously suspected had (cable, power supply, controller), even the 5m cable goes.
This was a loose connection somewhere. Something I had before at a similarly constructed housing USB 2, there then helped tape around the board. I clamped the internal power supply, maybe it has therefore never before recognized at 5m cable, am now too lazy to test it again.

Have now been over 2 TB and fro copied (jeweil on a USB 3 controller NEC and VIA chip tested), no reset, goes perfectly on controllers with NEC or VIA chip. Even if you send to sleep the drive by software, she wakes up again easily on when to access it.

If one reads the disk as an image so continuously from start to finish to get on ca 125MByte / s, is also on the board of, NEC or VIA is no difference.