Cloudflare in deed found drop in their transfer from those regions.
They are checking this issue with the Network engineers
This is cloudflare issue or issue with ISP providers in Belgium/Netherlands.
They still do not know exactly.
I will post more info once get answer from cloudflare.
P.S - can you check if simplemining.net will work via LTE and not via Belgium Line ISP ?
Edit1: Something just started to work
Edit2:
OK guys, finally. The Cloudflare told me that there was issue in their service which caused my simplemining.net server to be put in some kind of rate limit and it hapened only in Belgium region . Now it is fixed. They also made sure that this will never happen again for me.
Everything is working fine again. Thanks for the great support!