I'm running SOI sweepstakes using traffic from mainly propeller ads. However I've recently found that my lander domains keeps getting banned (3rd time this week). These are also .com domains. I've never had this happen before.
Has my machine been flagged by Google?
It happens from time to time, domains get flagged .com or not just switch to other one and you are good to go.
It could be various reasons for triggering like if you have ripped someone else LP with rather aggressive text and pictures and other elements.
It's weird. It comes and goes in waves for me too.
I'll go a month of two with nothing, and then out of the blue I'll get GSB flagged 3 or 4 times in a row within a week.
I would definitely change up some landers and check that you don't have any local scripts on your page named 'jquery' which really aren't 
Besides any aggressive scripts, do you have any logos that might flag your landers as deceptive?
Try to change things don't use same LP it might be in their database as a deceptive, a script, image or part of the code, structure of code - it could be metadata of image file, logo as platinum said, fake comment section that trigger the flag.
Also don't use .com domain unless you really have to.
They are getting expensive these days, you can buy lots of disposable domains and then switch them in no time.
It's like coronavirus
Your server IP and your landers were clean and than you borrowed some LP from Adplexity that It's not. They were host.
They don't care, it's just LP that shows up very often and have traffic, who knows how many affiliates used that LP before you.
Now you borrow that and run traffic. Google is famous for crawling sites among other things, so he will check that and compare with existing data.
So Google as a good robot as it is at some point said: Hey this seems deceptive, some part of this LP based on my previous data and input. I will flag this as something bad and move on.
And next thing you know, everything you put on that domain or subdomain is deceptive according to good old Google.
Will that affect your tracker depends on your setup, virtual hosts for LPs etc. etc. depends.
It's just a scenario, try to change domain and see what will happen. Most probably you will be fine but I can't be sure, try to figure out what LP caused that.
Best of luck and keep us informed 
It also depends where you run stuff.
I had the situation myself where I got my domains flagged after few hours maximum when I ran questiinnaires for Crypto offers in ZA.
Ran same lander in other Geos, no problem.
Ran it in ZA -> Flag
Tha lander also wasn´t aggressive at all in terms of logos or trademarks.
Thanks for the comments. I'll definitely treat this like a Coronavirus case..
I've just had 2 domains banned overnight and I'm not even running huge volume... About $100 a day. So somethings not right.
I'll start by deleting all the landers I am not using.
Then I will delete all the new landers i have downloaded and cleaned from adplexity.
I'll give it a day or two and see if it solves the problem.
If not I may have to get a new server.
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It could be an issue related with the GEO as well.
I’ve had a similar case like Twinaxe’s ZA case, running in CH and AT.
If you’re running multiple GEOs under the same domain, could be worth splitting them to separate domains to see if they last longer.
So the issue seems to have been solved.
I have separated my landers by domain and managed to isolate the cause of the domain bans to DE and AT. So I paused traffic running in DE and AT, and the domain bans have stopped. I suspect it also had to do with traffic source - Users might have been shown the ads multiple times a day and I think they might have been actively reporting them.
Thanks for the update, hopefully your solution cna help others who face such issues in the future as well.
Good to know that you got it solved.