Version 3 have problems

This have been for me, one of the best Softphones programs of all, but since this new version, it freezes a lot, you click buttons and it responds 10 sec later.
I like a lot more the last version.
I have an iPhone 5C, please fix this because I cant really use the app, unless I wait several seconds before I can use it normally.

Loma65 about Groundwire: VoIP SIP Softphone, v3.0.2