Missing local notifications after switch to summer time

Hi all, after switch to summer time (31 of March) some of our users began to complain about missing local notificatios (iOS 12.1.4, 12.2). Our app is a reminder which used all 64 slots for local notifications (UNNotification). They scheduled every time when users opens the app or do some actions in the app. Unfortenatly we can't reproduce this anyhow and Im asking your help, maybe there is known issues in latests iOS versions with switching to summer time and somebody has the same issue. Thank you in advance.