Ok I think you are going to have to try and provide some more details so we can help get your snap working under strict confinement, since as it currently stands, this snap does not meet the criteria for classic confinement as per Process for reviewing classic confinement snaps.
Can you please try and get logs from the application and the system when the snap is running and then when doing a suspend / resume cycle etc so we can see if there are any denials etc?