I'm not sure if it works with the TomTom One, but a fix/patch was released to enable the TomTom to get a fix on a satellite much faster from boot up. That said, I doubt it will help your problem. As Woolwell says, the only way to maximise ge chances of getting a good satellite signal are outdoors (ora t least, not in a house/building) and on a sunny day. But at 7yo, you're lucky it's still working. I had to dig an old One of mine out the other day because my wife had taken hers, and it spent an entire journey telling me to go left - when I knew I needed to go right. I think I'll bin it: a misleading satnav is actually worse than no satnav at all.
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