I have a 2 month old spider and a 3 month old normal that do that almost every night. Even more so in the couple days leading up to feeding day when they are more active than after they have just eaten. My enclosure is similar to yours except I use newspaper for substrate and I kinda cringe every time I hear the thump.
I've tried thinking of ways to stop it. One being to drill a hole for the thermostat probe wire to enter at the base instead of coming down from the lid. That's really the only way mine can get up there in the first place. I've also added a few fake plants to cushion their falls a little and it seems to help a little.
Other than that I'm thinking if it hurts them enough for them to feel pain they'll stop. They probably fall in the wild from higher than that. I've heard they would probably calm down after a few weeks of getting comfortable.
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