DeGingerNinja

Hey everyone, i recently obtained a MB vectrex here in Tasmania and went to ebay to purchase a game. The issue is that when playing ( berserk ) when i walk it fires once every second or two but im not pressing any of the 4 fore buttons. Doesnt do it when standing still and you can still fire pretty fast when trying to play normally. When playing mine storm nothing seems to be wrong with inputs My thoughts are maybe something to do with the original capacitors ?? Which i do plan on replacing as it only boots to the player 1 screen until its been on for a few minutes ( 3-5) and then you reset Or could it be the cartridge itself ? Thankyou im very new to the vectrex but very experienced in soldering. Jarrod