I too was having problems with Titegroup. Sometimes it just wouldn't drop anything into the case. After I used up the TG I bought some W231. Same problems. Then I noticed something. The chain that pulls the disk back was loose and sometimes it did not pull the disk all the way back and that's when I got little or no charges. I adjusted the chain and ran another 50 with no problems. I'm keeping my fingers crossed.
I've also used VV N320/N330 and it works great even with the apparent chain problems.
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