Wireless connection erratic on Lenovo Y530 laptop

[b1naryman]

I have a Lenovo Y530 Legion that periodically drops the WiFi connection. It will usually reconnect after 30-60 seconds, or I can force it by turning off and on the wireless adapter. I changed the value in the default-wifi-powersave-on.conf file from 3 to 2 and rebooted. It had no effect. Wired works flawlessly. Here is my base system info and networking hardware:

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System:    Host: AJB-Legion Kernel: 4.15.0-38-generic x86_64 bits: 64 gcc: 7.3.0
           Desktop: Cinnamon 3.8.9 (Gtk 3.22.30-1ubuntu1) dm: lightdm Distro: Linux Mint 19 Tara
Machine:   Device: laptop System: LENOVO product: 81FV v: Lenovo Legion Y530-15ICH serial: N/A
           Mobo: LENOVO model: LNVNB161216 v: SDK0R32862 WIN serial: N/A
           UEFI: LENOVO v: 8JCN44WW date: 08/13/2018
Network:   Card-1: Intel Device a370 driver: iwlwifi bus-ID: 00:14.3 chip-ID: 8086:a370
           IF: wlp0s20f3 state: up speed: N/A duplex: N/A mac: <filter>
           Card-2: Realtek RTL8111/8168/8411 PCIE Gigabit Ethernet Controller
           driver: r8169 v: 2.3LK-NAPI port: 3000 bus-ID: 07:00.0 chip-ID: 10ec:8168
           IF: enp7s0 state: down mac: <filter>

Another issue is I'm only getting around 15MBs speeds even though my sig strength is 90+ percent and connect info shows a 36 MBs connection. The same machine running Win 10 machine tests around 70 MBs, so that leads me to believe the wireless driver is the culprit. My circuit tests at 170 MBs down on a wired connection behind the firewall, so my WAN is not the issue. Is there a different Intel driver out there that may help?

Cheers,
Adam.

[JeremyB]

Lets try a test

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sudo modprobe -r iwlwifi
sudo modprobe iwlwifi 11n_disable=8

See if that improves the connection issue

[b1naryman]

Done. Thanks Jeremy. That had no effect on the speed. I'll post later after I have had a chance to test everything and get some operation time.

[b1naryman]

It's still dropping out Jeremy. Can you explain what that command did? Should I reverse it?

[JeremyB]

That command enables aggressive tx for the wifi and in the past it has fixed some connection issues and increased download speeds. To reverse

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sudo modprobe -r iwlwifi
sudo modprobe iwlwifi

Or just reboot, if you rebooted after running the command to enable aggressive tx, the change was reverted

[b1naryman]

Thanks. I'm going to try an external adapter for kicks.