This is correct, and this is surely the reason you are experiencing all that, you are limited to only 4 clients, one is used by the authenticator itself, a second one is used by the safe_app plugin to load your webpages, plus the ones you use from the apps or from the webpages themselves.
We have a plan to automatically free resources when tabs are closed, but it’s not implemented yet. Also, when you free resources it may take some time until that actually takes effect, so there is some pending work to be done there.
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