What I have noticed is there is a LOT of ddos traffic going on in EU atleast lately. Many ppl with certain modems are affected to this for the reason to not have it updated or using the default password: admin.
Not many ISP have a good protection against this kind of traffic coming inside from their clients, so not necessary it is the ISP fault.
Imo you could try to change the DNS server apart from your ISP, but it is up to you, nor does it help. As for the change for DNS I wont say no more and it takes some knowledge anyways AND can mess up your connection.
Just saying, that our servers most likely are not the issue until you provide a good winmtr report about it.