Booting with the previous linux image 126.96.36.199 and after setting firmware
swtich fwlps to off , seems that established a rigid connection.
Maybe the new kernel 188.8.131.52 is more "sensitive" on the FW flags, since i
had never issues before with fwlps which had been left to it's default
value (1) for a lot of months.
Maybe i could try to upgrade again in the new linux-image 184.108.40.206 and see
how it performs with fwlps off.
I switched off fwlps by using
echo "options rtl8723be fwlps=0">/etc/modprobe.d/rtl8723be.conf
(or could be done by adding above line in the end of the existed
modsetting.conf file in the same directory).
PS: All the rest options of rtl8723be are left to default.