[bug] Import disturbed on random basis

[s2b-git]

Latest stable version
Powerful bare metal fully configured in line with Yetiforce recommendations (PHP, extensions, memory etc)

On random basis (what patter I have no idea) and when import is successful, table u_yf_import_1 is not removed automatically preventing subsequent imports.
This issue is a significant blocker, as users here importing data on daily basis.
Imported data is always in necessary shape as it coming through import template.
Reporting it as a bug, but maybe I missed something?

[mariuszkrzaczkowski]

[mariuszkrzaczkowski]

in order to be able to fix a bug, we need to be able to cause it, without it, it's looking in the dark