If you’re seeing the storage reappear then your issue is probably related to how you’re registering the store. In our implementation we always attempt to register the store before accessing it. If the store already exists, the register call does nothing.
Also, each store that you register creates a unique file in:
with the name format VH****
If you really think your is disappearing I would locate the VH file that contains your store and monitor the existence of the file. Again, I suspect that if you’re seeing the data reappear the store is in fact still there.