Later 3 months with the issue i left the server. I gave it other opportunity to ovh and i rent another server in another datacenter.
I buy another OVH server (in Roubaix) in this case, and i move my current IPs (a /27 and a /28 subnet). And yes, working without issues, absolutely, at this time! And of course with the same IPs And i hope that this continues well.
It is clearly that is their issue, due "certain" routers in "certain" locations/routes are bad and/or overloaded and do nothing, simply.
Over this past 3 moths talking with OVH regarding issue, and sending all kind of logs and evidences, the always remit me reboot in rescue mode and test on my main IP, of course i can´ t set vmac for additional IPs on rescue and of course they don´t take care of this, since there are a virtualization "software" and they remit me again to rescue mode and test.
So it appears stupid, but i could think that they knows perfectly the issue, but they really not want upgrade their routers and/or infraestructure in this case, it is expensive.
I can not understand in any way case omise all of clients giving this results and evidences. And sure maybe hundred or thousands ovh customers with the issue, but they don´t make test, simply "works" and is enough for them.
I´m sorry for this words but i have to say.
Now, all apart of this, in the new server (more expensive) in Roubaix working like a charm since 4 days.
So resuming: another server and good luck!
Greetings!