Tone of problems

I have a tone of problem since 3-4 months with S2member, I don’t know why because I have been using the plugin the last 2 years and never had bug like that.

1. EOT- when someone cancel his membership from the S2member it demote his account directly without respecting his last payment date, it should set up a EOT and demote it on the right date.

2. I can’t accept paypal payment through the pro form.

3. 2 time on 3, when a payment is suspended from paypal, it doesn’t demote the membership level to subscriber.
Everything is setup as it was in the beginning, please help because now I’m really thinking about switching my membership plugin, I can’t find any solution and just want to fix it.
Thank you for your help and I hope we will find the solution.

Marc