Account shadow banned

So my situation is one of my accounts which I have never had any issues or flags has been shadow banned any ideas what has happened?
This account is an aged account and has been used for just over a month set up through proxy plus anti detect browser I have more accounts with the same set up but they are fine.
Does reddit randomly shadow ban?
Some sites will monitor baclinks built. ex- make rediit, wordpress, medium posts and start building crazy amounts of backlinks to it or even many links inside a post of new account. Could it be that?
 
Some sites will monitor baclinks built. ex- make rediit, wordpress, medium posts and start building crazy amounts of backlinks to it or even many links inside a post of new account. Could it be that?
I`m not posting/using any links
 
It might be that Reddit detected the IP as a proxy. Other cause might be related with your activity, if you break some rule or some users reported you.
Yes probably his account was flagged due to shared proxies
 
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