Yes they should be OK. If the temp was only at 39 for 30 mins or so, it won't have been long enough to raise the eggs to that temperature, so they shouldn't be harmed. The 35 degrees for a short period certainly shouldn't affect them either.
However, obviously this doesn't bode well for the rest of the hatching period if it keeps happening. If possible I would request an exchange incubator from wherever you bought it, as your contract is with them, as obviously the one you have is not fit for purpose. But, you need to make sure you have a stable temperature with the new one before swapping over.