What is going on in planetside?

[wolfspider]

I thought I would get an opinion on what has happened to me during my latest 15 minute session. I started playing Saturday evening after a couple of days off from the game. I started with no grief points, shot down one reaver and got into one large battle inside a tower which we lost. I received 9 grief point during that enemy rush and also shot one plane down. I'm almost a BR16 so I thought I would play a while and try to accumulate some points. After returning to sanctuary, i found I had over 500 grief points. I left the game and immediately returned with the 500 points still present along with the stupid message to be careful in battle. I have played over 2 months without having more than 30 grief points, especially since I hardly was in a battle. My question is what is with this game and how long will it take for this to return to a normal level.