Nexus 5 3G connection hangs topic

Hello, sometimes I have this problem that I randomly can't use 3G data. The 3G icon is still grey (if there's no data its brown), but nothing that requires internet works. Also, the two small arrows near the 3G icon show me that no download is taking place (no down pointing arrow) and only upload arrow is active. Does anyone else have/had this kind of problem?

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