I'm having users complain about form timeout / system unavailable (multiple individuals)

I copied an earlier used form and then updated it a little

I published it out to our users and some are successful with the form but others are getting this error

I was able to submit your form. I think that was just a temporary issue. I have re-saved your form and cleared your forms cache. I hope this helps. Can you check again? 

Thanks we will try again