DUAL WAN Failover version v2.1.2 and router RT-AX88U_PRO

[dexu]

I have a problem with version v2.1.2 and router RT-AX88U_PRO After a few hours the WAN0 link starts to float. Pings increase and the logs show the message:

Oct  4 09:46:25 wan-failover: Packet Loss Detected - WAN0 Packet Loss: 33%
Oct  4 09:46:32 wan-failover: Packet Loss Detected - WAN0 Packet Loss: 33%
Oct  4 09:46:47 wan-failover: Packet Loss Detected - WAN0 Packet Loss: 33%
Oct  4 09:49:56 wan-failover: Ping Time Above Maximum Threshold: 80ms - WAN0 Ping Time: 89ms
Oct  4 09:49:59 wan-failover: Ping Time Below Maximum Threshold: 80ms - WAN0 Ping Time: 14ms
Oct  4 09:50:13 wan-failover: Ping Time Above Maximum Threshold: 80ms - WAN0 Ping Time: 203ms
Oct  4 09:50:16 wan-failover: Ping Time Below Maximum Threshold: 80ms - WAN0 Ping Time: 49ms
Oct  4 09:53:07 wan-failover: Ping Time Above Maximum Threshold: 80ms - WAN0 Ping Time: 80ms
Oct  4 09:53:07 wan-failover: Packet Loss Detected - WAN0 Packet Loss: 33%
Oct  4 09:53:10 wan-failover: Ping Time Below Maximum Threshold: 80ms - WAN0 Ping Time: 70ms
Oct  4 09:54:19 wan-failover: Packet Loss Detected - WAN0 Packet Loss: 33%
Oct  4 09:56:22 wan-failover: Ping Time Above Maximum Threshold: 80ms - WAN0 Ping Time: 114ms
Oct  4 09:56:26 wan-failover: Ping Time Below Maximum Threshold: 80ms - WAN0 Ping Time: 14ms

When the same link is connected as WAN1, I disconnect the second cable then .. It works as it should. Is it time to buy MIKROTIK in its place to support 2x WAN?
Both links are connected to ETHERNET. One static IP address, the other wan is the address obtained from DHCP.

Best Regards, Marcin.