You’re not alone!
This is has been a long running issue (checkout the Apple community forums) with Catalina, especially if external monitors are attached to the system, since its release. Updates over the last few months have helped (you should update your system to 10.15.4 including the supplement update made available in the last day or so) but I don’t think they’ve managed to bottom out the problem just yet. I’ve just got used to shutting down & restarting instead of letting the system sleep.
Archicad isn’t perfect either & constantly generates CodeMeter errors on my system (take a look at the Console). Hopefully, the latest update (released for the Solo version yesterday) will solve this problem…
AC16-24 Solo (latest version)
OSX 10.15.6 - MacBook Pro 16" 2.4 GHz 8-Core Intel Core i9 - 64Gb DDR4 - AMD Radeon Pro 5500M 8 GB