I'm sporadically kicked off the internet on macbook pro (early 2015 running El Capitan). My other computers (both macs) on the same wifi network do not get kicked off. Please help!

Hold down Option while you click on the Wi-Fi Icon on the menuBar. You get a statistics display like this:

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what do you get for PHY mode and Channel?

What do you get for RSSI or Signal Strength?

what do you get for Transmit Rate?

and very important, how many other networks do you see?

You are up in the 5GHz band, using a good wide channel.

signal strength of about -31 -85 is a truly excellent -54

your transmit rate and MCS index (rating of complexity of modulation technique) is very high, indicates you are using multiple streams with very little interference.

You should be having no problems whatsoever.

On that same menu is an Item "wireless diagnostics" it is not the same one as in system preferences. Launch that and it will check things out, then progress to this screen if it finds no immediate issues:

Just click continue and leave that window open and go about your business. If something exciting happens, you will get an alarm.

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Please see Apple's recommended settings for Wi-Fi routers and access points.

Notwithstanding those recommendations, some routers work better with late-model Macs if you disable the 2.4 GHz radio mode in the settings and use only the 5 GHz mode. Note, however, that very old Apple devices and some third-party devices may then not connect at all.

Some third-party routers have advanced settings that you may need to change:

The encryption algorithm should be AES.

The group-key interval should be 3200.

Do you have the problem on other Wi-Fi networks, or only on yours?

What have you already done to try to solve the problem?