I am not aware of any VPN specific issues. A properly set up VPN would be near impossible to detect anyway.
The term "kicked me out" implies the server is actively rejecting your connection, that could be caused by someone who used the same VPN address and got an IP ban against it.
If however by "kicked me out" you mean that the connection times out, or does not get initiated properly, well, that could be caused by a whole host of configuration issues where some of the traffic might not be sent through the connection properly. The issues there could range from the VPN not allowing certain ports, to traffic being sent back to improper (internal) addresses or anything else.
