ssh just stop working

Hello everyone,
As I am open suse beginner I need to ask you for some help.
I configured my ssh long time ago, opened port forwarding directly on router settings and it works fine (I could connect from every network via ssh until today.
I have no idea what’s happened, I have checked settings on router - looks fine, same with firewall (off), port 22 is running, same with sshd…
Guys, any idea please what else could I check ?
Thanks in advance

What errors do you get?

When I’m trying to log via putty then Network error: Connection timed out …

Wrong IP, wrong User, wrong Port, Firewall?

Maybe see in the error.log of your putty?