1 - which Pi are you takling about - i.e. which one did you reflash the sd card on, the pi3 or pi2?
2 - how big is the SD card and how much free space is on it?
3 - what brand is the SD card and how long have you been using it?
4 - how big is your flow - i.e. how many tabs, how many nodes (approximately)
5 - can you provide your flow? read How to share code or flow json
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