Holes forming under/around garage

Question

I've noticed two holes forming in the ground, under and around my garage (so no basement or anything under that location. The house is about 3 years old.

The first is under driveway, just in front of the garage (there's a cavity under the asphalt there, maybe about 6" deep and 6" wide):

The second is immediately under the wall of the garage, on the other side of the (two-car) garage door from the driveway hole (note also the crumbling mortar to the left of the hole):

I have several questions about this:

Are these holes potentially related, or are they far enough apart that they're more likely separate issues?
Should I be concerned about any of these issues, and if it's hard to say from my pictures/descriptions, who would I call to investigate?
What is causing the driveway hole? Can it simply be filled in, or would it require a bigger fix? 
What is causing the hole under the wall? Is it just settling or soil washing away? Can I simply fill it with more dirt?
What caused the mortar to crumble? Is that usually the sign of more crumbling, or is it sometimes just an isolated instance?

Ed Beal · Answer

I would believe your gutter downspout pipes are in that location(s) if not well sealed or if perf pipe was used without being packed in gravel the dirt gets washed away and creates a hole. I would look for this being the cause as I have seen this when solid pipe was used and cracked later washing the dirt away. Look in the hole if you see a drain you probably have found the reason.

Answered by Ed Beal on February 11, 2021

Steve · Answer

After consulting a landscaper and a driveway paver, it appears the issue was primarily just settling/runoff. With the bricks, for some reason, the builder had them overhanging the foundation by about half an inch, which made the hole seem bigger than it was. The landscaper filled the gap under the bricks and the missing mortar with hydraulic cement. The paver cut open and refilled the hole in the driveway and didn't see anything concerning or indicative of a larger issue when he had the hole open.

Answered by Steve on February 11, 2021

Holes forming under/around garage

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