This is not an issue with the Overwatch client itself, but rather a configuration issue with your internet or modem. The staff has a thread with support information for this type of issue pinned at the top of this forum:
Most games don’t require the 60+ packets per second that Overwatch does, so it might be overloading part of your network.
You mentioned opening a ticket in a thread you made in the Competitive Discussion forum, but I didn’t spot any previous Technical Support threads on the account you’re posting from.