my Vivosmart 4 has stopped syncing data since April 21st. Shall I toss it and get another device or is there a fix for this!! Very annoying!!!!

No data showing in the app. Last recorded data is on April 21st. Since then nothing is shown in the app. I have unpaired device and uninstalled rthe app. Did all again from the begining. Seems to be working now. What caused this? I have lost 2 weeks data!!