Usually this is dirty condenser coils under the unit and/or the condenser fan is not operating correctly.

Coils can be cleaned with a long thin brush and a vacuum.
Be gentle when doing this.

I remove my kick plate and rear cover and then roll the unit to an open kitchen door. I then blow them clean with a compressor and most of the dust ends up outside. A leaf blower also works.
But this may not be possible for you depending on your kitchen setup and what tools you own.