Pioneer MVH S520BT resets every time

Hey,

The headunit in my bass van started to forget everything after turning acc off.
Headunit is Pioneer MVH S520BT. Just over 2 years old. Since its not losing 12V constant i assume it has a problem with memory chips. After taking it apart i found 2 memory chips inside. One is W25Q16JV and second one W25Q64JV. How possible is that one of them is faulty thus it forgets everything after turning off ignition?
I have 0 experience with headunits thats why i thought i look here for help first.
Thanks.
 

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