Wifi keeps dropping

No need to be sorry. I was going under the assumption that the connectivity issue was on the 5 GHz band as that was what the numbers you provided me earlier indicated so that's why I recommended that you try others ... so it could easily be "my bad."

If it is either band, then you don't need to "look" for a specific 5 GHz network, any should do ... like one at your local coffee shop. The idea is to verify if your notebook is having connectivity issues will any network, not just yours.

Only Apple can give you a cost estimate; however, before going this route, there are a few things you can try:

• Run Apple Diagnostics to see if it uncovers any hardware issues with your MBP:

  Use Apple Diagnostics or Apple Hardware Test - Apple Support

• Reset your MBP's SMC:

  Reset the System Management Controller (SMC) on your Mac- Apple Support

• Reset your MBP's NVRAM:

  How to reset NVRAM on your Mac- Apple Support

Thanks for the additional details. I'm trying to help you rule out Wi-Fi interference or the MBP itself as being the issue. By trying other Wi-Fi networks would help determine if the MBP is the culprit.

However, a few things to try before doing so are:

1. If your condo Wi-Fi network broadcasts on two different radio bands: 2.4 & 5 GHz, try connecting to the other band to see if it stays connected more effectively. Note that the higher frequency has more difficulty traversing through things, like walls. So if your MBP is connecting to the 5 GHz band and you use it in a room where the wireless router is NOT located, this may be the reason.
2. Create a new user account on your MBP. Log-off of your current account, and then, log back in with the new one. Do the drop-offs still continue with the new account?
3. Staying with your current user account, relocate your MBP to near the wireless router, hold down the option key, and then, click on the Wi-Fi icon on the macOS menu bar. Note the values for :
   • Security
   • Channel
   • RSSI
   • Tx Rate
   • PHY Mode
   • MCS Index
4. Jot them down. Then move your MBP to other areas in your condo where you typically use it for Internet access. Note the values and jot them down as well. Please post these values so I can get an idea on how well your MBP is connecting to the wireless network.

The numbers look good. I forgot to add the "Noise" value. Would you please take the measurements at the same two locations, but provide the noise values at each as well?

A couple of things in the mean time:

1. I would strongly suggest that you reconfigure your wireless router's security level to WPA2 only. Since it's not an Apple router, that setting may be something like: WPA2 - AES
2. The MCS value identifies a number of things, including the number of spatial streams that are being used in the Wi-Fi connection between the router and your Mac. A larger or smaller value is meaningless. Instead it defines the actual connection type. A value of 7 for an 802.11ac connection would indicate that the connection is using 3 spatial streams with a maximum data rate of 877.5 Mbps. Pretty much what you are getting. However, 802.11ac is capable of having connections of up to 1300 Mbps if all the conditions are "right." This would be an MCS value of 9.
   Ref: MCS Index - 802.11n and 802.11ac

Does your MacBook Pro (MBP) have this issue with one specific Wi-Fi network or any Wi-Fi network that it connects to? If one specific network, is this network operating in an area where there are numerous other Wi-Fi operating as well ... like in an apartment complex, or dorm?

It may be possible that this 2015 MBP has a defective AirPort Extreme card or wireless antenna that is causing it to loose connectivity on the 5 GHz band at your home.

I don't think you ever answered my question on, whether or not, it has this issue when connected to other 5 GHz networks and would be helpful if it does ... as this would indicate the notebook as being the culprit.

Sounds like it's time to make the Genius Bar appointment. Good luck!