Thanks for your answers.
@dolby
Did you change anything like adds or scripts in the past weeks? Maybe my add blocker or anyplugin is the culprit.
I'll test some more with disabling all plugins of the browser and using another browser. Maybe it's a network issu somehow.
Noticed this behaviour only within the gitter app on android in the past or the outlook . app if there are long conversations you need to answer to and press the "show all" link. Very unrespsonisve somehow