Encrypted volume disabled after 90 minutes of use

[szszszsz]

Device's EV is being replaced with UV after some time of usage, resulting in having 2 volumes with UV's content.

Frequency: sometimes (depends on time?)
Details: https://support.nitrokey.com/t/nitrokey-crashes-disconnects-when-transfering-files/2138/5

Reproduction steps:
OS: Windows 10
Storage firmware: v0.54

1. Unlock EV;
2. Copy many small files over a long time, covering 40-60 minutes for a transaction;
3. Repeat step 2 3-5 times;
4. During file copy use the smart card and access Nitrokey App features.