I understand and I will do my best to help you.
I found this reported bug which may be related your issue. Please try adding the following CSS snippet:
If the flickering continues, could you try to remove the Metronic framework and see if the tooltip still flickers?
To investigate further and help you with a workaround, I will need the zip file of the Angular application. Before sending, please remove the 'node_modules' folder to save space and let me know if you would like me to change the ticket to a private support ticket.
Also, I recommend creating a support ticket (instead of Forums post) in the future for a faster turnaround of 24 hours from the support team. The support tickets are also private than public.
I hope this information helps.
Virtual Classroom, the free self-paced technical training that gets you up to speed with Telerik and Kendo UI products quickly just got a fresh new look + new and improved content including a brand new Blazor course! Check it out at https://learn.telerik.com/.