I hope someone can help me please with my questions.

I am a non-EU citizen married to an EU citizen for almost 5 years now and we are living in Spain. I have a residence card on the basis of this marriage and t is up for renewal. What happens if I won’t be able to renew it on time due to unforeseen circumstances?

Also, I read on the Internet that one of the requirements for renewal is a legalised and authenticated OR apostilled marriage certificate issued no more than three months prior to renewal application. Is this applicable throughout Spain or for specific areas only?

Lastly, is changing the type of my permit from regimen comunitario to regimen general applicable in my case as I have been a resident for almost 5 years now? What are the benefits of regimen general as against regimen comunitario?

Thank you very much in advance.