@Paulnguyen 

Hi, apologies for the delayed response.

Can I have more details about the issue then we can try to figure it out?
1. Can you confirm if the wired connection of this WR940N is good or not?

2. May I know how many devices are connected to the wireless network? Are all of them experiencing the same high ping? Can I have some screenshots about this huge package loss?
3. Modify the wireless settings, such as wireless channel and channel width, it is suggested to run a Wi-Fi analyzer to find a clear channel, then change the channel width to 20MHz, reboot the router and reconnect to the wireless network, then confirm.

4. Feel the router, if the router is hot or lots of heat coming out, put the router in a well-ventilated location or mount it vertically on a stand that permits the free flow of air, or use a fan to cool the router, a regular fan or USB fan is fine.