I have results...
First of all, I'm using Server 2008 what is about the same than W7
I completely removed my firewall & now:
[2018-06-13 05:04:02] CryptonightV7 mode enabled
[2018-06-13 05:04:44] DevFee pools loaded
[2018-06-13 05:04:44] DevFee pool SET
[2018-06-13 05:04:44] DevFee address SET
[2018-06-13 05:04:44] Starting init of mining threads
Devfee pools are loaded but still taking too long to start, about 42 seconds what is best than previous 78 sec.
This does not happens in W10
Also the self shutdown of SRBminer after 4th reconnect only happens in Server not in W10
The good part of Server is that with the RX 580 4GB I can set intensity to 61 in V7 while in W10 I can only set 59 loosing some H/s
Update:
Now with "DevFee pools loaded" the program does not self close after the 4th reconnect under Server 2008, so it was related to the firewall blocking.
Sounds estrange, I just tested once for now but it must be that.
Update 2:
The program self close randomly, only when max_difficulty is used.
I've seen after 15-20 minutes & near 2 hours. Maybe when the devfee is going to start?
No more tests for now, I'll wait next version to see if it works fine.