new ESP-8266-DEV board doesn't connect to WIFI

[lbalas]

Dear Support,

we ordered 60 pcs MOD-WIFI-ESP8266-DEV board at the begining of February (in two orders). Every device work well: the boards connect to the WIFI in 4 secs.
We ordered 100 pcs more last week and I've received today. I tested all boards and the boards DON'T connect to the WIFI at all. I found 2 pcs (from 100!) what could connect after 5 MINUTES but after that devices time to time lose the connection.

We use the same software, we use the same WIFI AP, we use the same PS, we use the same distance between the AP and the devices.
The differences between the two ("old" and "new" board) are:
- ESP chip: "OLD": ESP8266EX 512014 P1WX73, "NEW": ESP8266EX 512015 P46N93
- Memory chip: "OLD" WINBOND 25Q16DYSIG 1516, "NEW": WINBOND 25Q16DYSIG 1606

We didn't find more differences.

Currently we cannot use the second contingent, in turn we received the package in late because you had to test the devices. (your support colleague gave me this explanation).

Please advice what we can do.
If you need some proof (video, log, pictures) please let me know.

Thanks in advance,
lbalas

[JohnS]

Would you not be far wiser to contact support or sales direct?

John