Steady increase of ping with every patch

It happens only in LoL. My Internet provider hasn't changed and I still have my 150Mbps UPC connection (cable). Few months ago I had 28-35ms on EUNE (about 40ms on EUW). Then after few patches it jumped to 40-45. After the last patch I'm having 49-55ms. I don't think that's acceptable. If this trend continues, soon I will be better off playing on NA... Has anyone else noticed this? My connection works ok with every other online game and/or online service. Only the connection to Riot servers gets slowly worse and worse with every patch.
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