Hi guys, hopefully someone can help me with this on a short time, since I have campaigns running.
Today I've received the following email from Monetizer:

This is my current setup. I'm running some campaigns in Zeropark, direct linking to afflow links. No landing page in the middle, and I'm using Amazon Route 53 as per STM recommendation.
I have no idea why this is happening, so if someone can advice how to get this solved and more important, how to prevent this from happening again it would be really great, since I have a couple of campaigns running. I guess I could just create another subdomaing, but it's not a long term solution.
Thanks!
Domains are tough to really solve, they will all get flagged at some point. In your case, it could be because of where you buy traffic from, it could also be because of the offers you send traffic to.
Your only realistic solution is to replace it and then hope the next one lasts longer. You should try to blacklist bot placements so you don't get too much bot traffic in the future - I noticed a lot of such ZoneIDs/placements create issues with our domains.
It's certainly not the only factor and doesn't guarantee anything, just keep that in mind...
Thanks for the tip manu_adefy. They got back to me and recommended to set up a new domain as well. The bad news is that I was using this domain to host my landers for other campaigns, so I'll have to move them too.
According to what happened, I guess the best option is to register a new domain just for my landers and keep registering new domains just to use for afflow each time this happens.
Do you guys use a similar strategy?
And what would be the cheapest domain extension to register, having in mind this could be an ongoing issue with Monetizer?
Domains getting flagged seems to generally just be part of pops. Of course, some verticals are much more likely to lead to a flag, and maybe fairly quick (AV for example). Buy cheap domains (you can find some for $0.99, just make sure you turn auto-renew off
), keep a few "on hand", set up and ready to go with your hosting, so you can quickly replace them when stuff like this happens.
I'm already starting to envision a tool using Amazon AWS SDK + registrar, that can roll out fresh domains, fully set up with a few clicks... 
Just change it.
It's probably the offers being promoted from monetizer.
You might want to have several domains not only for your landers, but also per offer/geo in case disaster happens to reduce your risks.
Agree. Just registered a couple of .bid domains ($0.88 with whoisguard protection at Namecheap).
BTW, is it necessary to set up the domains with route 53 for afflow or an A record at namecheap will work the same?
.club and .website also used to be cheap. The others have already answered your other questions. 