It is more than interference.
The WWAN connection will drop frequently when:
- 1 there is more than one AP with the same SSID around, and BSSID Lock is not used (use advanced settings at first connect, and set BSSID Lock)
- 2 there is more than one SSID in the known network list in the same or other band (remove the others)
- 3 When the uplink AP is using MPDU aggregation, then packets with more than 32 MPDU are dropped (the IEEE 802.11 defines the limit at 64, not 32), causing disconnects
- 4 When a disconnect occurs (and no fixed IP address was set, but eg DHCP) with mode=router, then all open sessions and NAT are dropped before reconnect, even when returning to the same AP and SSID.