Q: Keys some times needing two presses to function correctly

Wired or wireless keyboard?

If your wireless or USB keyboard doesn't work

Keyboard Doesn’t Work

Keyboard Keys Do Not Respond

Keyboard/Mouse – Troubleshooting Wireless

Reset an Apple Wireless Bluetooth Keyboard, Mouse or Trackpad (Troubleshooting Pairing and Other Common Problems)

Bluetooth devices become unresponsive

Bluetooth Interference Sources

Bluetooth Interference Sources (2)

Bluetooth Wireless Problems

If your Wi-Fi is capable of generating a 5 GHz signal, try that.

Restart the computer holding down the command - option/alt - P - R keys before the gray screen appears. Continue to hold until you hear the startup chime for the second time.

Reset NVRAM/PRAM

As a test, have you tried attaching the keyboard directly to the computer? Do you have access to another keyboard to try? That might help determine whether it is a keyboard or computer problem.