Intermittent Keyboard Issues

[AndyLegacy96]

Envy X360 Convertable 15-ds1xxx

As of a week ago, I am suddenly having issues with keyboard responsiveness and overall weird behavior. I've read some other threads of users having the same issues as me, yet they never get fully resolved. 

Symptoms:

1. Keystrokes intermittently will not respond. There are no particular keys that don't work at a given time. It seems to be random. Repeatedly pressing the desired key will eventually register.

2. Some of these keystrokes will register as capital letters although unprovoked, neither caps lock nor shift having been selected. During these episodes, caps lock doesn't seem to respond at all.

3. Just as randomly as the other symptoms, the number keys will register their respective symbols as though caps lock were on. 

4. External Bluetooth keyboard demonstrates the same exact behavior. HOWEVER, the on-screen keyboard does NOT have the issue.

Troubleshooting attempted:

I have run every single diagnostic tool available on my PC. All OS updates are complete and all drivers up to date. Restarted multiple times. As mentioned previously, problem persists with external keyboard but not with the on-screen keyboard. I'm unsure if that would necessarily narrow down hardware/software issue.

At the time of my writing this, my computer has had two of these episodes. The first was last week before it randomly began functioning properly again, and the second was last night in which I threw every solution I could think of at the problem. Currently, the keyboard is working just fine; having done no additional troubleshooting since throwing in the towel last night. 

I'm a senior mechanical engineering student who has dedicated 100% of my note taking to this laptop that is less than one year old. I can't afford another keyboard issue once the spring semester starts, so I'm really hoping someone here can help me permanently resolve this issue. Thanks.