What routines did you use "cleaning" you computer? I can't imagine that is where the problem lies, but if you can eliminate it by not connecting it for a while I suggest you try. Use a tablet or phone if you need Internet access.
Remember to turn off wireless access on your computer of course and detach its Ethernet cable if you use wired. It's the connection by it, not the use, that has a tiny chance of being the problem.
As a joking aside, with your nick surely you expect instability!
My broadband basic info/help site - www.robertos.me.uk
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UnLim Fibre (FTTC). Sync ~ 57.2/15.0Mbps @ 600m. - IPv4BQM
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- G K Chesterton.