CPU throttling occurring despite no need for It

[Vahid-Javani]

My Ubuntu keeps freezing randomly usually 10 seconds in five minutes and I thought this problem is related to CPU frequency, because based on the following script, it goes under 400MHz. The CPU is Intel 2310m and my laptop is HP Probook 4530s.

while true
do
sleep 0.5
freq=$(lscpu | grep 'MHz' | awk '{print $3}' | head -1)
cond=$(echo " 500 > $freq " | bc -l )

if [ $cond -eq 1 ]
then
    date
    echo "$freq"
fi
done

These are the things that I had done:

1. Adding the following parameters to Kernel boot (/etc/default/grub) intel_idle.max_cstate=0 processor.max_cstate=0 idle=poll intel_pstate=disable

2. sudo systemctl disable ondemand

3. sudo apt-get purge thermald

4. Reinstalling the whole OS!

5. I have checked the CPU temperature with lscpu and it was less than 50 Celsius.

6. Renstalling the kernel http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.15/

7. There is nothing special in dmesg or /var/log/syslog

8. Trying with Ubuntu 16.04.0 with the old kernel from 2016

The result of cpupower frequency-info:

analyzing CPU 0:
  driver: intel_pstate
  CPUs which run at the same hardware frequency: 0
  CPUs which need to have their frequency coordinated by software: 0
  maximum transition latency:  Cannot determine or is not supported.
  hardware limits: 800 MHz - 2.10 GHz
  available cpufreq governors: performance powersave
  current policy: frequency should be within 800 MHz and 2.10 GHz.
                  The governor "performance" may decide which speed to use
                  within this range.
  current CPU frequency: Unable to call hardware
  current CPU frequency: 552 MHz (asserted by call to kernel)
  boost state support:
    Supported: no
    Active: no
    25500 MHz max turbo 4 active cores
    25500 MHz max turbo 3 active cores
    25500 MHz max turbo 2 active cores
    25500 MHz max turbo 1 active cores

I don't understand this output. It says the range is 800-2100 MHz, and then claims the current freq is 552 MHz. Also 25500 is 25 GHz! 

[VahidJavani]

There is no service center in my city, should I throw it to trash?!