MK63 - AX1800 (Costco) MR60/MS60 V1.0.6.110 Wi-Fi Issues

I recently bought an MK63 - AX1800 WiFi-6 Mesh router from Costco that has 1 MR60 Router and 2 MS60 Satellites (The Model option above does not list this router so I chose RAX200). I configured it manually and upgraded it to the latest MR and MS firmware V1.0.6.110. I see that this version throttles Wi-Fi speeds down to 10 Mbps at times and I saw my kids complain. I was in the middle of a meeting and I saw the video and voice cutting off on my Zoom meetings and it was a horrible experience. I ran a speedtest when I saw this happening and my DS rate was down to 10Mbps!!! I usually get 150 Mbps+.

I also see my printer (Brother HL-5470DW that is on the 2.4GHz band) goes offline often. I have to manually reboot the router and satellites and it seems to fix the issues but it keeps recurring. This router has some serious Wi-Fi issues that needs to be fixed!!

I also see frequent DoS Attacks: Fraggle Attacks and RST Scans. Anyone knows about these Fraggle Attacks?

[DHCP IP: (192.168.1.5)] to MAC address 08:5B:D6:82:3F:4D, Thursday, Mar 25,2021 13:47:05
[DoS attack: Fraggle Attack] from source 10.73.132.1,port 67 Thursday, Mar 25,2021 13:45:17
[DoS attack: Fraggle Attack] from source 10.73.132.1,port 67 Thursday, Mar 25,2021 13:45:07
[DoS attack: Fraggle Attack] from source 10.73.132.1,port 67 Thursday, Mar 25,2021 13:44:53
[DoS attack: Fraggle Attack] from source 10.73.132.1,port 67 Thursday, Mar 25,2021 13:43:33
[DoS attack: Fraggle Attack] from source 10.73.132.1,port 67 Thursday, Mar 25,2021 13:43:08
[DoS attack: RST Scan] from source 3.15.116.22,port 443 Thursday, Mar 25,2021 13:42:50
[DoS attack: RST Scan] from source 13.107.42.14,port 443 Thursday, Mar 25,2021 13:41:43
[DoS attack: Fraggle Attack] from source 10.73.132.1,port 67 Thursday, Mar 25,2021 13:39:41
[DoS attack: Fraggle Attack] from source 10.73.132.1,port 67 Thursday, Mar 25,2021 13:37:55
[DoS attack: Fraggle Attack] from source 10.73.132.1,port 67 Thursday, Mar 25,2021 13:37:37
[DoS attack: Fraggle Attack] from source 10.73.132.1,port 67 Thursday, Mar 25,2021 13:36:52
[DoS attack: RST Scan] from source 63.251.14.3,port 443 Thursday, Mar 25,2021 13:36:48
[DoS attack: Fraggle Attack] from source 10.73.132.1,port 67 Thursday, Mar 25,2021 13:35:53
[DoS attack: Fraggle Attack] from source 10.73.132.1,port 67 Thursday, Mar 25,2021 13:35:33
[DoS attack: RST Scan] from source 172.217.11.170,port 443 Thursday, Mar 25,2021 13:32:56
[DoS attack: RST Scan] from source 3.123.188.246,port 443 Thursday, Mar 25,2021 13:32:36