[BUG] Accessories disappear after a few minutes
Everything works fine initially, but after a few minutes all accessories disappear from homekit.

The bridge device is still visible, but all the accessories are gone in the home app. This affects ALL homebridge accessories, including unrelated ones (e.g. Lifx), not just the samsung tv. The accessories still show up in the homebridge-config web UI with insecure mode, but are not visible in the Home app. 

Restarting homebridge or removing the homebridge from homekit then re-adding, fixes it temporarily but a few minutes later all accessories disappear again. I have also tried changing the user/pin but that made no difference.

Removing the samsung-tizen plugin configuration (i.e. removing the platform config), fixes the problem with the other non-samsung accessories, so it does seem to be related to this plugin.

This issue in homekit looks like it describes a similar problem:
[From KhaosT:](https://github.com/nfarina/homebridge/issues/570#issuecomment-197463206)

> HomeKit will unpair (aka lose) accessory when it think the accessory's behavior is out of compliance. In the case of homebridge, this normally occurs when one or more plugin returned invalid value for characteristic reads. Ideally if all plugin developers enforce the value it returns for characteristic is valid, this should never happen. For now I'd suggest you try to isolate the plugin that causes the problem and contact plugin developer to address the problem.

Here's my config:

{
            "platform": "SamsungTizen",
            "inputs": [
                {
                    "name": "Netflix",
                    "type": "app",
                    "value": "11101200001"
                },
                {
                    "name": "Prime Video",
                    "type": "app",
                    "value": "3201512006785"
                },
                {
                    "name": "Hulu",
                    "type": "app",
                    "value": "3201601007625"
                },
                {
                    "name": "Plex",
                    "type": "app",
                    "value": "3201512006963"
                },
                {
                    "name": "YouTube",
                    "type": "app",
                    "value": "111299001912"
                },
                {
                    "name": "YouTube Kids",
                    "type": "app",
                    "value": "3201611010983"
                }
            ],
            "devices": [
                {
                    "name": "Samsung TV",
                    "ip": "192.168.1.15",
                    "mac": "E4:7D:BD:C8:73:B7",
                    "switches": [
                        {
                            "name": "Mute",
                            "mute": true
                        },
                        {
                            "name": "Sleep",
                            "sleep": 60
                        }
                    ]
                }
            ]
        }

**Note, I did not have this problem with the pre-3.0 version of the plugin.**

**Versions (please complete the following information):**
 - iOS: 12.2
 - Node.js:  v10.15.3
 - Homebridge: Version 0.4.47
 - Plugin: 3.0.1 
 - Running in oznu/docker-homebridge
