Had the same issue not long ago,managed to somehow fix and it hasn't happened today(even tho I was playing for over half of the day )
Tho,I had lag spikes,frequent disconnects and freezing issue.
STEPS
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Delete/Uninstall all programs you aren't using,but might pop up during your game (anti-virus programs which can be put on silent mode or disabled briefly).
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I followed this video https://www.youtube.com/watch?v=OxC9KlO6CWk
Skip the first and third part,but do the second and fourth
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I have NVIDIA Control Panel set it to full Performance .(Don't know how much it helps,since I nearly always close this program )
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Open the Client and Launch a full repair
After all that,you should scan your computer for Viruses or any other activity which may harm,before you log in make sure that Close client when playing-box is ticked and Low spec mode enabled.
If you're playing on wire-less,try if all the cables your rooter are properly plugged in.
Lastly(if possible) a laptop cooling pad can do wonders.
I'm not an expert,but I went through these steps and it seems the issue has been resolved. Hope it helps anyone. Good luck