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Hi, @Lorfatz!
Welcome to the Forums! Hmmm...is this the first time your experiencing this issue?
I recommend you to check the list of compatible devices because I have not seen the Samsung A3 on the list. When this happens it means that it has not been fully tested by our web engineers so it might work but not 100%, so you might experience issues with it.
I'll be waiting for your updates!
I am also having problems with syncing my Charge 2 device since the update with my Motorola Droid Turbo. Snyc worked successfully from January 2 until yesterday. I've tried several suggestions via this forum to no avail.