I am experiencing very frequent short internet dropouts on my TP-Link Archer NX600 router. The router is connected to the T‑Mobile 5G mobile network. The issue occurs multiple times per day (around 10 times).

The symptoms:

• All connected devices lose internet connectivity for a few seconds.
• The TV stream stops immediately, which makes the issue very easy to notice, but the dropout affects every device on the network.
• The LEDs on the router remain normal during these short outages.
• Occasionally, the router restarts by itself, causing a longer outage due to rebooting.
• Signal strength is excellent (100%).
• I have already replaced the power adapter — no change.
• I have tried a different power outlet — no change.

The problem persists regardless of load or time of day.

I would appreciate guidance on how to diagnose the cause or whether this could indicate a hardware or firmware issue.

Thank you.