It's best to go to Polsat Cyfrowy and ask there, the instructions do not show anything

maybe it is replaceable or you are actually doing something wrong
Added after 23 [minutes]: I read that from November 30, 2017 there is new firmware for the EVOBOX PVR decoder, update it and see if it will be the same. The new firmware version for these decoders is: 2.2.1.
Added after 1 [minutes]: How to update the software:
Automatically on standby. In normal operation (turned on), the software will be downloaded in the background and the decoder will display a screen on the TV screen asking you to carry out the update process. Confirmation will start the update, while refusal to do so will execute the update when the decoder goes into standby mode. You can manually start and check for a new version by going to Settings -> Hardware settings -> Software update.