The app keeps crashing on my devices

The app keeps crashing these days on my iPhone and iPad.

First, when opening the app, the app is pretty laggy.

When I try to create new transaction records on my iPhone, after clicking the save button, the app crashed immediately. The background apps also are reloaded after leaving Budget Flow. I think the phone memory has been used a lot when loading the database of Budget Flow.

The app on my iPad hasn't been opened for some weeks. When it try to sync the data from iCloud, it also crashes after a while and the syncing will be failed. The recent transaction records can't be downloaded successfully.

I also checked the system log named JetsamEvent. It said the largest memory used app is BudgetFlow. And it contained the following information.

"freeze_skip_reason:" : "out-of-budget"

"reason" : "per-process-limit"

I used to find another log of BudgetFlow in the system settings, which said error occurred about SQL. But the log has been cleared and I forgot what the exact issue description is.

Please give me some suggestions. I can provide the whole log if needed. Thanks!