@neounix Same Issue with me the connection keeps dropping several times a day. TP Link we need a fix for this,  this is happening after upgrading with latest firmware. 

 @PKaruna 

Thank you for confirming.    I also consider this a serious bug and Ialso hope tp-link will fix this problem ASAP;

I ended up moving off the Tapo P100 for a scheduled reboot and instead am trying the NX510v feature do to this scheduled nightly reboot.  

(Note to tp-link:  please add markdown support so uses can kindly format forum posts)

## Bandaid solution (not really acceptable for such an expensive device) - this feature can only set one reboot time, so more-than-likely will revert back to scheduled power cycles with the Tapo P100 (not a fan of hard power resets)

  @PKaruna 

Just a quick update.

I fixed the hanging and dropping issues with my NX510v setup by locking the channels manually (manual mode, not auto mode).  This issue is caused by AUTO band selection in NSA mode. When the NX510v switches LTE anchors (e.g., B1 ↔ B3) during low-traffic hours, the firmware hangs. Locking just one 5G band (e.g., N41) with one 4G anchor (e.g., B3) fully resolves the issue. Scheduled reboots are a workaround, not a solution.

--- SUMMARY ---

TP-Link NX510v – Fix for Modem Hanging / Freezing Overnight

Device: TP-Link NX510v

Problem:
The NX510v would hang or freeze, typically late at night or during low-traffic hours, requiring manual power cycling. WAN connection would drop, and in some cases the admin UI became unresponsive. No automatic recovery was observed.

This behavior occurred when using default settings and AUTO band selection.

Suspected Cause:

In AUTO mode, the modem dynamically switches between 4G LTE anchor bands (e.g. B1 and B3) while maintaining a 5G NSA connection. During low-traffic hours or tower-side maintenance, these anchor handoffs may cause the modem firmware to become unstable and freeze.

Solution:

Manually lock the modem to a single stable 4G anchor band and your primary 5G band to prevent band-switching errors.

Steps:

1. Log in to the NX510v web interface.

2. Navigate to the hidden band locking page:

3. Select ONLY two bands:

   • One 5G band (e.g. N41 or N78, depending on your carrier)

   • One 4G LTE anchor band (e.g. B3 or B1 – whichever gives better signal quality - region / carrier dependent)

4. Save 

Results:

• No more nightly hangs or modem lockups.

• WAN remains stable through overnight idle periods.

• Manual reboots are no longer necessary.

Important:

• Do not select multiple 4G bands (e.g. B1 and B3). This appears to reintroduce the instability.

• If unsure which LTE band is best, test them one at a time.

• This workaround is especially useful for users running in 5G NSA mode.

--- END OF SUMMARY ---

Note: Credit to ChatGPT 4.5 and 4o for helping me analyze the configuration params, signal behavior and isolate the band-switching issue using OODA-style diagnostics.