You have a weird attitude. If you want ask something better start another way.....
If it is just a comment - thanks and do not come back.
Mine ALWAAAYS last your LIFE + delay (app 10 to 20 sec).
KARKAND has always been like that-since BF2 - loose the main and you are in bad situation - no vehicles.
If your team is too noob to know that - then your have a team problem.
You defend it or come back when attacked. Mine only last as long as you live. And they can be destroy.
So relying on mine to save your main is not a good strategy.
I don't see a server problem, just a bad or no strategy.