Is there any way we can change the turret,hulls and paint (whatever we own) without going into garrage in the middle of the game?

Hi, I have a i3 laptop wiht quad core processor, 6GB Ram and 100 GB free space. Whenever I play the game, suddenly the screen pauses for few seconds. Some times, I am unable to control the moment. At these times, I dont know what is happening inside the game. Even I tried reducing the screen size, but still the same problem How do I overcome this?

Thank you for your help. But my crystals are not disappearing out of magic. What I tried to communicate is, even I make purchase, those purchases are not added to my inventory, but the crystals are accounted for the purchase (getting reduced from my account)

Hi, Every time I buy super power, double armour, n2o I loose crystals bit these are not added to my inventory. Becuase of this I have almost lost 3000 crystals. Request you to let me know why this is happening , what should I do in this case and how to get my crystals back? -RBS100