Outdated Spotify app
Internet connection is slow
Cache data full
Corrupted data
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Visit Spotify Status's official Twitter account.
If the Spotify server is down you will get to know by some tweets by Spotify
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Pay attention to the tweet timestamps to ensure that its not old
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01
Turn off your router completely by taking out the power cable from the power switch
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Now leave it for 2 minutes and then plug it back in
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And check for your internet connection.