@Sean Thanks for your suggestion. It definitely helps. Thanks.

I have similar situation like @Mondfisch described. And once problem appears, I got below log:

[15:46:23.437] [LOG] [SPOTIFY] API Request fail on : /v1/me/player
[15:46:23.440] [LOG] { Error: Client network socket disconnected before secure TLS connection was established
at TLSSocket.onConnectEnd (_tls_wrap.js:1092:19)
at Object.onceWrapper (events.js:273:13)
at TLSSocket.emit (events.js:187:15)
at endReadableNT (_stream_readable.js:1090:12)
at process._tickCallback (internal/process/next_tick.js:63:19)
code: ‘ECONNRESET’,
path: null,
host: ‘api.spotify.com’,
port: 443,
localAddress: undefined } undefined
[15:46:23.458] [LOG] Whoops! There was an uncaught exception…
[15:46:23.461] [ERROR] TypeError: Cannot read property ‘statusCode’ of undefined
at Request.request [as _callback] (/home/pi/MagicMirror/modules/MMM-Spotify/Spotify.js:199:34)
at self.callback (/home/pi/MagicMirror/node_modules/request/request.js:185:22)
at Request.emit (events.js:182:13)
at Request.onRequestError (/home/pi/MagicMirror/node_modules/request/request.js:881:8)
at ClientRequest.emit (events.js:182:13)
at TLSSocket.socketErrorListener (_http_client.js:382:9)
at TLSSocket.emit (events.js:182:13)
at emitErrorNT (internal/streams/destroy.js:82:8)
at emitErrorAndCloseNT (internal/streams/destroy.js:50:3)
at process._tickCallback (internal/process/next_tick.js:63:19)
[15:46:23.470] [LOG] MagicMirror will not quit, but it might be a good idea to check why this happened. Maybe no internet connection?
[15:46:23.472] [LOG] If you think this really is an issue, please open an issue on GitHub: https://github.com/MichMich/MagicMirror/issues
[16:09:49.712] [LOG] Shutting down server…

I tried to uninstall and install the module, but no luck, the problem keeps exist. Not sure if there is any solution on it.