I confirm that, yesterday and today I got finally all my sent boards working at some point with hairdryer trick: need some effort to start hashing but now I have a method to overcome reset problems until final solution is found. Many thank asjfdlksfd to share this with us.

My last mission now is investigates one board stop hashing after some hours: but for me is a minor annoyance...

Lucko/MrTeal: If board pre heating seems so reliable to solve this reset is possible simulate this behavior on firmware?
I wonder if after all everything is OK with board and main reason of problems are only some of Lucko's BFL chip batch are slightly out of specs. This happened on cointado board so is not completilly out of question.

My last restart ( even knowing 1 board will became "sick" during this night i am happy for first time
 since entered on this project ) :

bfgminer version 3.9.0 - Started: [2014-01-09 21:43:00] - [  0 days 00:22:39]
[M]anage devices [P]ool management Settings [D]isplay options  [H]elp [Q]uit
Connected to eu-stratum-*****.btcguild.com diff 64 with stratum as user ****
Block: ...4e2576ff #279578  Diff:1.42G (10.15Ph/s)  Started: [22:05:30]
ST:14  F:0  NB:7  AS:1  BW:[ 65/ 55 B/s]  E:511.17  I: 1.92mBTC/hr  BS:293k
4      69.0C | 146.9/135.5/128.1Gh/s | A:641 R:2+6(.34%) HW:2911/6.2%
-------------------------------------------------------------------------------
BFL 0: 69.0C | 35.61/29.63/28.57Gh/s | A:128 R:0+0(none) HW: 681/4.6%
BFL 1: 69.0C | 36.24/34.98/33.74Gh/s | A:175 R:2+0(1.1%) HW: 443/3.9%
BFL 2: 60.0C | 36.94/35.67/33.86Gh/s | A:170 R:0+0(none) HW: 611/5.4%
BFL 3: 69.0C | 34.78/35.25/31.94Gh/s | A:169 R:0+6(.11%) HW:1179/ 10%
-------------------------------------------------------------------------------
[2014-01-09 22:05:25] Accepted 018093b1 BFL 1  pool 0 Diff 170/64
[2014-01-09 22:05:25] Accepted 02310d9c BFL 0  pool 0 Diff 116/64
[2014-01-09 22:05:26] Accepted 0026ec8f BFL 0  pool 0 Diff 1.68k/64
[2014-01-09 22:05:26] Accepted 039f0d4f BFL 3  pool 0 Diff 70/64
[2014-01-09 22:05:27] Accepted 0187d6f1 BFL 0  pool 0 Diff 167/64