I have a question regarding my Bitcoin Merch Mars Lander which shows a lot of hardware errors during mining.

The are some stats of my Mars Lander after mining for "1day 23h 24m 13s":

• Accepted: 26,016
  
• Rejected: 5
  
• Hardware Errors: 10,928
  

That is a ~42% Hardware Error rate which I think is insanely high. It does mine at an average of 288 MH/s. So, just to be sure, I e-mailed Idan Abada from Bitcoin Merch and this is his reply:

"Hardware errors are normal. I see 289 GH/s, the advertised hash rate is 250. You are doing wonderful!"

When I said it's a 50% hardware error rate at that time, I got a reply back saying:

"Yes as long as your hash rate is normal, yours is very high so very good!"

So, my question is: is a 42% hardware rate accepted when mining at an average of 288MH/s? To me, it sounds like faulty hardware.