Test where the television sits
A fast connection near the router can still be weak behind a TV or across a concrete wall. Run the trial on the actual viewing device in its normal position.
Compare a wired connection
If your device supports Ethernet, use it briefly to separate Wi-Fi interference from other causes. On Wi-Fi, compare an available 5 GHz network and avoid hiding the streaming stick behind dense equipment.
Use your normal evening conditions
Run a trial while other household devices are active. Note whether the problem affects all channels or only a single feed. Do not assume a provider or a condo building is the cause without comparing.
Keep a short troubleshooting record
Write down the device, time, connection type and result of each change. Send that to support so the team can help without repeating every step.