Occasional doorbell notification issues for the UVC G4 Doorbell in Protect v1.17 and later
**Describe The Problem:**
I don't receive push notification when somebody rings at the door with the UVC G4 Doorbell.

**To Reproduce:**
Wait for a delivery :) 

**Logs:**
[UniFi Protect] Cloud-Key-Gen2-Plus [UCK-G2-PLUS]: Discovered camera: Doorbell [UVC G4 Doorbell] (address: 192.168.1.147 mac: **********).
[UniFi Protect] Cloud-Key-Gen2-Plus [UCK-G2-PLUS]: Controller refresh interval set to 10 seconds.
[UniFi Protect] Cloud-Key-Gen2-Plus [UCK-G2-PLUS] Doorbell [UVC G4 Doorbell]: Discovered doorbell message switch: LEAVE PACKAGE AT DOOR.
[UniFi Protect] Cloud-Key-Gen2-Plus [UCK-G2-PLUS] Doorbell [UVC G4 Doorbell]: Discovered doorbell message switch: DO NOT DISTURB.

[2/15/2021, 2:05:31 AM] [UniFi Protect] Cloud-Key-Gen2-Plus [UCK-G2-PLUS]: Connected to the UniFi realtime update events API.
[2/15/2021, 2:36:26 AM] [UniFi Protect] Cloud-Key-Gen2-Plus [UCK-G2-PLUS]: Connected to the UniFi realtime update events API.
[2/15/2021, 5:23:39 AM] [UniFi Protect] Cloud-Key-Gen2-Plus [UCK-G2-PLUS]: Connected to the UniFi realtime update events API.
[2/15/2021, 5:50:42 AM] [UniFi Protect] Cloud-Key-Gen2-Plus [UCK-G2-PLUS]: Connected to the UniFi realtime update events API.
[2/15/2021, 8:06:29 AM] [UniFi Protect] Cloud-Key-Gen2-Plus [UCK-G2-PLUS]: Connected to the UniFi realtime update events API.
[2/15/2021, 8:34:30 AM] [UniFi Protect] Cloud-Key-Gen2-Plus [UCK-G2-PLUS]: Connected to the UniFi realtime update events API.
[2/15/2021, 9:58:47 AM] [UniFi Protect] Cloud-Key-Gen2-Plus [UCK-G2-PLUS]: Connected to the UniFi realtime update events API.
[2/15/2021, 12:13:59 PM] [UniFi Protect] Cloud-Key-Gen2-Plus [UCK-G2-PLUS]: Connected to the UniFi realtime update events API.
[2/15/2021, 1:09:11 PM] [UniFi Protect] Cloud-Key-Gen2-Plus [UCK-G2-PLUS]: Connected to the UniFi realtime update events API.

**Homebridge Configuration:**

            "controllers": [
                {
                    "address": "192.168.1.10",
                    "password": "*********",
                    "username": "homebridge"
                }
            ],
            "platform": "UniFi Protect"

**Environment:**

* **Homebridge Version:** V1.2.5
* **Node Version:** v14.15.5
* **Homebridge-UniFi-Protect Plugin Version:** v4.3.5
* **UniFi Protect Version:** 1.17.3
* **UniFi Protect Controller Type:** UCKgen2+
* **UniFi Protect Controller Firmware Version:** 2.0.27
* **Apple Device and iOS / macOS / iPadOS / tvOS Version:** AppleTV, Iphone
* **Operating System and OS Version:** Docker on synology


