Library Yield Problem

[Seqwork]

Hello,
I have low library yield problem with Illumina trueseq stranded total RNA kit.My final library yield is not detectable on Qubit.Sequence facility returned samples as they didn't pass test run.I have tried almost everything.New reagents,more input, longer adapter ligation times.
I checked yield after Ds cDNA synthesis, which was good.Something always goes wrong between A-tailing and adapter ligation.After second wash with beads, i m losing all.
Kindly suggest something.
Thanks

[nucacidhunter]

TruSeq RNA kits are very robust and following user guide instructions without any modification should give good results. If you are using correct amount of bead and incubation time for clean up and loosing your library two things could be the cause: 1) incorrect Ethanol solution (lower percentage) will elute library and naturally it will be thrown away, 2) not using proper elution buffer.