Why are you running Splashtop streamer?
The Mac has VNC and Screen Sharing / remote Management built in...
If it works without Splashtop streamer - then un-install it !

What OS are you using?
If you have the option, use 10.12.6
There is no benefit to upgrading to 10.13.x or 10.14.x

ALSO ensure App Nap is DISABLED on the Catalyst Application (see Get-Info tick box)
Right click on Catalyst application / Get-Info / tick the 'Prevent App Nap' box

Regards

Simon