...and do give us reasonably-full computer system specifications and full, accurate name of your computer's operating System
so we can better assist you please.
Note my system specs and
full OS name are readable to you, as I had so established as my Forum Profile "Signature" accordingly.
(It's revealed below).
You (and Newbies here reading this) might do well to do the same, to facilitate getting speedier, meaningful assistance from this fine user community.
Set up your "Signature" from the Forum's Control Panel.
Now, as to your quirky audio playback issue, make sure your computer's Audio Driver PLAYBACK settings -- for the specific Audio Device you want to be using, are properly matched to the very audio settings you've established in Resolve's Project Settings > (General Options is it?)*
If I'm wrong on thar path, try looking in Davinci Resolve > Preferences for audio Settings.
In short, make them suitable for your audio device's playback settings abd vice versa.
Also
Make sure on the EDIT page, the menu item
PLAYBACK >

PERFORMANCE MODE is checked (it toggles on or off by clicking once on it and is alternately confirmed by a visible checkmark to the left)
If on PC, ASIO an Audio driver is likely your best option performance-wise
*I'm not absolutely sure about the path for Audio settings as I'm not near my Resolve workstation at the moment. With System Specs let us know if this did not help.
Cheers!
Peter
Resolve Studio v14.3.0.014 | MiniMonitor | DTV 10.9.7 | Win64 8.1 | ASUS ROG G751JL, 2.8GHz Intel i7HQ, 24GB, 1TB HDD, 500GB EVO 850 SSD, 2GB GTX965M | Mackie MCU Pro | Softube Console 1 Mkii | Cintour Designs Shuttle Pro 2