Nope, well, there are many reasons that could be causing this issue. How many access points do you have in your infrastructure? Have you performed a site survey? It's normal to have dissociation when clients doing roaming.
So I suggest two things:
First read the documentation.
Second, try to update client's driver Wi-Fi.
I am not a Cisco Meraki employee. My suggestions are based on documentation of Meraki best practices and day-to-day experience.
Please, if this post was useful, leave your kudos and mark it as solved.