I have had my Ipod touch 4th gen for 2+ years and was working fine until I upgraded to ios 6.1.3. Now I cannot play games and most of my apps keep crashing.

My ipod was working just fine for the past 2 years and ever since upgrading to ios 6.1.3, i simply cannot play games or anymore such as Subway surfers, carrot fantasy, 4 pics 1 word, etc. I also noticed that i had 1.2 GB of free space on ios 5.1.1 but then decreased to 900+ MB after "upgrading" to ios 6.1.3. I then deleted one of my space-hungry apps (the sims freeplay) to clear up some space and now have 1.6 GB of free memory. Just a thought, could apple have purposely done this with their software update to actually make an older, phased-out product such as my ipod touch 4th gen work worse than it has in its previous versions of softwares to force you to scrap it for a newer product?