Did you do a full power cycle, disconnecting power and unplugging the battery leaving it off for 10 minutes? If not do that first. Steps can be found here.
How are you powering the panel, via the included power supply and cable, or an existing cable run?
Additionally, ensure your panel’s firmware is at the latest, 4.5.2. Patch notes and update instructions can be found here.
Following the power cycle and firmware update, if the issue does not resolve, run a Siren Test. Navigate to Settings > Advanced Settings > System Tests > Panel Test > Siren. This will take about 10 or so seconds and the siren will sound (it will be loud, fair warning).
After triggering the test, test the system for functionality. Does the pop noise return?
If that does not resolve the issue, please submit a short video with sound of the issue to us via Private Message for confirmation.
If using 24/7 professional monitoring you may want to place your 24/7 professional monitoring account on Test Mode during troubleshooting to avoid any false dispatches.
You can do this by calling monitoring operators directly at 855-348-0367 or from the Test My System tab in the System Manager section of your Surety account.