Hi Stefan?
there is a MicroSD. ?
These can come lose (with constant knocks) and sometimes needs reseating. ?It¡¯s an easy task, shown in the link. ?If it¡¯s a newer HC (the first one shown) then it¡¯s easier to access.?
Just undo the 4 HC case screws open the case gently don¡¯t put pressure on the display. ?You should be able to access the SD card with tweezers or such like to reseat it ? ?You do not need to disassemble the whole HC to do so.?
Try this first. ?Also consider reformatting and installing the SD card and it¡¯s appropriate files to ensure it¡¯s ok. ?They don¡¯t last forever but should last long enough ? I suspect it¡¯s a HC card issue.?
Unfortunately Sending the System to be checked is not a cheap process. ? You can send it to USA or ?any of the repairers. ?I¡¯m the Australian repairer. ?Have repaired one Kiwi G2 users unit¡¯s (for a south island school.). ?But postage etc each way is not cheap?
So might be best if we can talk you thru checking the SD ?HC card. ?
Get back on this.?
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Brendan