Is the FSP ZEN 300 badly designed only or the FSP is a bad designer and does not notice "small" malf

[Ko]

Hello!
I bought FSP ZEN 300 fanless PS. It made a crackling sound sometimes,
which was accompanied with a monitor screen image trembling. The shop
replaced it with another FSP ZEN 300. The second FSP ZEN 300 makes the
crackling sound 10 times rarer, but still makes the monitor screen
image tremble during that time. Is this a ZEN 300 bad design only or
the FSP is a bad designer and does not notice such "small"
malfunctions? I can replace the FSP ZEN 300 with FSP 350-60GLN only in
the shop. Is the FSP 350-60GLN good?
Best regards,
Dima
+79035093892