high CPU usage

Hi
I got galaxy note 4 ,wanam ROM,xposed, 910c
When I connect to wifi or mobile internet cpu usage suddendly raises dramatically from about 5% or 6% to 30% or 40% (some times even more) and I'll get UI lag , superfast battery drain and superhot phone.. When I check "3c toolbox " I got this on the top of the list :

/system/bin/dhcpcd 99.88%
/system/bin/surfaceflinger 1.70%
kworker/0:2 1.60%
xposed_service_app 1.35%
/system/bin/mediaserver 1.31%
Swype + Dragon 1.31%
AFWall+ (Donate) 1.01%
zygote 0.96%
kworker/0:1 0.68%
kworker/0:0 0.58%
kworker/0:3 0.54%
/system/bin/servicemanager 0.43%[QUOTE][/system/bin/dhcpcd 99.88%
/system/bin/surfaceflinger 1.70%
kworker/0:2 1.60%
xposed_service_app 1.35%
/system/bin/mediaserver 1.31%
Swype + Dragon 1.31%
AFWall+ (Donate) 1.01%
zygote 0.96%
kworker/0:1 0.68%
kworker/0:0 0.58%
kworker/0:3 0.54%
/system/bin/servicemanager 0.43%
I have AFWALL firewall but disabling that didn't help...
The only option I got is to kill the process manually (which is a rough option you know )and after that every thing will be normal...
What's the problem?
Thanks in advance