Spotify keeps loosing synched tracks on my windows phone

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I have synced almost 6 Gb of music on my iPad and on my Windows Phone. I have absolutely no issues with the iPad, but for the last week the Windows phone,lost all synched music twice.

The offline tracks are still visible but they are just not playable u til I go online and I sync them again. What's weird is that the music seems to still be on th micro-SD card. I can tell from the disk usage.

This,is,happenning while I'm not even connectes to the internet. I'm on vaccation right now and this is the time of the year I'd,really want to be able to listen to my music offline, so I'd appreciate a fix for this issue.