Im a steam player too and have this Issue as well (not using vpn) just on other "randomd" spots.
Eg. When im for a longer time (~10mins) at tower (at vault most often) it starts and ends alway with a reconnecting.
Another thing that happens often since Lightfall release is a centerpete error at startup (around every 5th time) but after that error login and playing works normal.
TBH as European i think the Cause has something to do with the Connection from NA to EU just dont know if its Bungie or if its Steam OR if it is cause Bungie and steam dont share information often :D
English
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There is no such thing as a single connection between continents. There are thousands of routers interconnected using a protocol called BGP - if one path fails, another is being used and you won't even notice.
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It’s not just you or even steam for that matter. I play on Xbox and I’m getting the connecting to server banner constantly and getting booted out of the tower. Good time.