As the name suggests, my front bike tire's inner tube has suddenly started leaking air for no apparent reason. I used my bike on Sunday on a fairly rough trail, but everything seemed fine afterwards. The following Wednesday, I used my bike to go to work and once again, I didn't notice anything out of the ordinary.
This friday morning however, I decided to check my bike's tire pressure and noticed my front tire was slightly deflated, nothing major. I started to remove the cap from the Presta valve and air started leaking like crazy until it lost all air and the core somehow fell off. I assumed that the issue was simply with the core being loose, screwed it back on and inflated my tire back to full, with my valve leaking absolutely no air this time.
However, after a mere 100m on my bike, I could already notice that it had lost some air. I left it at home and came back to a completely deflated tire.
I'm confused. How come it didn't leak much, if any air from Wednesday to Friday, and now cannot hold air anymore, despite the fact that it was stored in my appartment? Is this a faulty valve? I don't have any specific reason to believe I could have punctured my tube either on Wednesday.
Thanks a lot for your help!