[c-nsp] Cisco 6800 in V.S.S. with IA not working

[R S]

Hi folks,
my problem is here.

A couple of brand new 6880-x-le just configured in VSS (IOS inside 15.1(2)SY2 and later I put SY3), continuos reporting in console "rebooting" or "downloading", console not responding sometimes, one IA (C6800IA-48TD) working and other two no with the same configuration... a complete nightmare.

And more: two of the 4 cards (C6880-X-LE-16P10G) arrived with led of the interfaces completely switched-off (but ports working..)

I found only one bug for C6880 (CSCup99867) with severity: 1 Catastrophic...

Now the questions are: 

1) is it only my nightmare ? 
2) any experience to share ?
3) any way to troubleshoot on IA side ?

Raccomended IOS release (facing the bug report is: 15.1(2)SY3.48, but I'm wondering... ) ?
any additional experience on your side ?

greeting from utrecht