Lock expired - what could have happend?

[Simon Ryf]

Hi Zaid,

Do you have any Idea why this could have happened?
Restarting the whole server solved the issue (at least for now).
Where do you think I should start looking if it happens again?

Thank you
Br
Simon

2017-06-14T14:10:49.797Z [ERROR] Uncaught exception; exceptionName="Error" exceptionMessage="Lock expired" exceptionStack="Error: Lock expired
      at Command.callback (/opt/genieacs/lib/cache.js:59:24)
      at normal_reply (/opt/genieacs/node_modules/redis/index.js:721:21)
      at RedisClient.return_reply (/opt/genieacs/node_modules/redis/index.js:819:9)
      at JavascriptRedisParser.returnReply (/opt/genieacs/node_modules/redis/index.js:192:18)
      at JavascriptRedisParser.execute (/opt/genieacs/node_modules/redis-parser/lib/parser.js:562:12)
      at Socket.<anonymous> (/opt/genieacs/node_modules/redis/index.js:274:27)
      at emitOne (events.js:96:13)
      at Socket.emit (events.js:191:7)
      at readableAddChunk (_stream_readable.js:178:18)
      at Socket.Readable.push (_stream_readable.js:136:10)"
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