Could you please try the following configurations by accessing advanced settings on the card and the configurations on the router?
Preferred Band: Prefer 5.2GHz band
- 802.11n channel width for band 5.2: Auto (not in 20 MHz only)
- 802.11n mode: Enabled
Fat channel intolerant: Disabled
Roaming aggressiveness: lowest
Throughput enhancement: Disabled
Transmit Power: 5. Highest
Wireless mode: 802.11a/b/g
HT mode: VHT mode
On the router, you could try different channels
Auto channel scan: Disable
Set router Channel width to 40 MHz (mixed mode) try channels 36, 44, or 48.
- 802.11 mode: Use 802.11n only
Enable WMM (Wi-Fi multimedia) settings
Let us know if this helped you.