Why am I getting an Error on Save Message?

I keep getting the attached message. I cleared my cache, rebooted and when I tried to log in, my form page was there, but the forms were not. They eventually came back.

Also having problems with calculation fields not keeping the calculations.

Apologies for the inconveniences this may have caused to you. 

I have checked your account as well as the form you have shared us and I can see it is working fine so far, when opening the form in the Form Builder I can see it saves properly. 

I have checked the conditions as well as the calculations that you have in your form and I can see it works, here's what I can see for example: 

 Could you please check on your end again? 

I can also see there are 25 forms in your account, did you have more forms than this? 

I cleared your forms cache, please do let us know if you are still able to replicate the problem, we will be glad to take another look to your form.

Thanks, it happened a lot this afternoon, but has stopped.

Well, it started again. Anytime I use the calculation field. And I'm getting logged off too.

I have been having problems with calculation fields all day with them not saving.

I have tested again your form and checked the calculation wizards that you have there, I can see it works fine on my end so far, I cannot replicate the same problem, here's a screen-cast about what I can see when I checked your form: 

Could you please test your form in another web browser? 

If the problem still persists, please try also in incognito mode, this way all the cache will not be saved so you will be able to start a fresh session and find if the problem still happens.