Tap to click suddenly stops working

Hi katerinkaeg,

Welcome to the Apple Support Communities!

We understand that you're unable to use the tap-to-click function on your MacBook Air and it appears to come and go, correct?

To help us isolate this behavior further, we'd like to have you create a new user account and test this function in the new user account.

To create a new user account, you can go to the Apple menu  > System Preferences, then click Users & Groups.

Click the lock icon, then enter an administrator name and password.

Click the add button (+) below the list of users.

Complete the fields shown for an Administrator account, then click Create Account (or OK).

Once you’ve created the new account, go to the Apple menu  > Log Out, then log in with the new account to test the tap-to-click function.

If you don't experience the same behavior in a new user account, we'd recommend that you take a look at your login items as outlined here: Remove login items to resolve startup problems on your Mac

We hope this helps.

Cheers!

You're most welcome, katerinkaeg,

We appreciate you giving it a try! Next, we'd like to have you go to the Apple menu  > System Preferences. Then choose Trackpad, click the Point & Click tab, turn off Tap to click, then enable it again. Does this make a difference?

Do you have any external devices, wired or Bluetooth, connected to your Mac?

We look forward to your reply.

Best regards.

Got it, katerinkaeg,

Thanks for letting us know that you've also check your Mac with Apple Diagnostics.

Next, we'd recommend that you start your Mac in safe mode then attempt to use tap-to-click: How to use safe mode on your Mac

We'd also suggest that you start your Mac in macOS Recovery Mode and check the disk using First Aid: Repair a storage device in Disk Utility on Mac

Let us know how it goes.

Take care!