A8 lost network connection via LAN

[Dizhuster]

Hi. Is there a solution to the problem? I use two A8 modules. The first one rarely loses connection, and the second one disconnects at random intervals from about 30 minutes to 2-3 hours. Both modules are powered by the same 12v power supply and replacing the power supply did not help. When disconnected, the indicators on the network connector light up without blinking. Maybe it freezes?.. The problem appears more and more often over time, does it make sense to look for problems in the firmware?..