RTL8723BE unable to establish connection (fixed in 4.17.x)

[xalt7x]

With kernel version 4.10+ I'm unable to establish WiFi connection.
Router shows logs:
Association Success:STA **:*:**:**:**:**
4-way handshake success:STA **:*:**:**:**:**
Received Deauth:STA **:*:**:**:**:**(reason 3)

It works well with "rtlwifi_new" drivers or newer mainline kernels (4.17 & 4.18-rc3 work; 4.16 don't) so probably something could be backported from there. Any power-management or ant_sel driver options didn't help me. Closest things I managed to find were https://patchwork.kernel.org/patch/10196339/ (rtl8821ae keep alive not set, connection lostlogin) and commit from "rtlwifi_new" repo ("rtl8723be: Add L1 latency to rtl8723be" - https://github.com/lwfinger/rtlwifi_new/commit/196972510a4d4280b6773398f7f43609c66f8c35 ) but first is already in 4.15 & second didn't help me so that must be something else...

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: linux-image-4.15.0-24-generic 4.15.0-24.26
ProcVersionSignature: Ubuntu 4.15.0-24.26-generic 4.15.18
Uname: Linux 4.15.0-24-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.1
Architecture: amd64
CurrentDesktop: XFCE
Date: Mon Jul 2 16:58:39 2018
InstallationDate: Installed on 2018-05-31 (32 days ago)
InstallationMedia: Xubuntu Core 18.04 - amd64 - 20180509
SourcePackage: linux-signed
UpgradeStatus: No upgrade log present (probably fresh install)