I have a laptop-- a Lenovo ThinkPad t450. It had 4 Gb RAM, with an intel i5-3500 CPU at 2.3 GHz. It has been running Stardew Valley smoothly since I got it. But in the last month or two, it has started having small hitches/skips/hiccups every few seconds. I am not running any programs besides SV. Memory is only at approx. 80% and disk use is at maybe 50%. I'm running the game in windowed mode, vsync is off, and lighting quality is set to low. What else can I do to fix this? Thanks in advance.