XR500 Connection drops constantly due DHCP renewal

This is really painful, I think is since I upgraded firmware recently from Netgear. At random times, but most noticiable when I try to play a game like Overwatch. I lose connection to server and I am kicked out of the game and even penalized. It happened also with voice applications like Skype, Discord etc, not just games.

Checking the logs in DumaOS I can clearly see my Lan IP is lost and renew constantly, with the pattern below. This happens often and several times in a row. Even writing this post It was challenging at times for this reason. 

DHCP IP: 192.168.1.200] to MAC address , Thursday, April 29, 2021 20:34:45
[DumaOS] DHCP lease change., Thursday, April 29, 2021 20:30:47
[DumaOS] DHCP new event., Thursday, April 29, 2021 20:30:47
[DHCP IP: 192.168.1.200] to MAC address , Thursday, April 29, 2021 20:30:47
[DumaOS] DHCP lease change., Thursday, April 29, 2021 20:30:45
[DumaOS] DHCP new event., Thursday, April 29, 2021 20:30:45
[DHCP IP: 192.168.1.200] to MAC address , Thursday, April 29, 2021 20:30:45
[DoS Attack: SYN/ACK Scan] from source: 178.79.139.89, port 80, Thursday, April 29, 2021 20:30:44
[DumaOS] DHCP lease change., Thursday, April 29, 2021 20:30:41
[DumaOS] DHCP new event., Thursday, April 29, 2021 20:30:41
[DHCP IP: 192.168.1.200] to MAC address , Thursday, April 29, 2021 20:30:41
[DumaOS] DHCP lease change., Thursday, April 29, 2021 20:30:34
[DumaOS] DHCP new event., Thursday, April 29, 2021 20:30:34
[DHCP IP: 192.168.1.200] to MAC address , Thursday, April 29, 2021 20:30:34
[DoS Attack: SYN/ACK Scan] from source: 103.138.194.70, port 80, Thursday, April 29, 2021 20:23:30
[DumaOS] DHCP lease change., Thursday, April 29, 2021 20:19:27
[DumaOS] DHCP new event., Thursday, April 29, 2021 20:19:27
[DHCP IP: 192.168.1.200] to MAC address , Thursday, April 29, 2021 20:19:27

I have tried a bunch of firmwares from here, the beta, etc. Even one of the latest on DumaOS saying Fixed DHCP leases :(. I think my only option  at this point I guess is going back to a old firmware?

Now this router is pretty much useless and I can't understand how a bunch of firmwares trying to fix the issue, got nothing here. I am really disapointed.

Tried also factory reset, which is really annoying, giving static ip addres but still I get a renew lease on a reserved one, yay!

I have seen similar posts here but no real solutions, so please let me know what I can do other than buy another router.

Thanks.