Restrictions and Bans are handed out in waves, usually around every ~5 weeks or so. You can tell because every 4-5 weeks the forums swell with "WTF BANNED?!?!" threads over and over.
So your restriction could be for something weeks ago, maybe even over a month ago.
As of around June, Bungie has officially started restricting based on historic red-barring: meaning that if you had a tendency to have poor connection for a stretch they will restrict you as a "kick in the pants" to get you to fix the connection on your side if possible.
This is on top of the normal reasons.
A common reason is a "teammate" kicking opponents from Trials. So if you have played any Trials matches where the other team forfeited or only had 1-2 people a bunch of times -- then it's possible this is a reason as well.
As Vince said below (above?) : Bungie does not discuss or debate bans + restrictions. Period. This is likely because EVERYONE would argue it... even though obviously cheating. Then, who do you let back in? The better liar?
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That makes sense about fighting it but it still sucks because i dont have those problems, my friends are just really good and im starting to think that somebody was upset for getting beat too badly. Thank you for you reply :)