slim version prone to overheating issues unless use in air conditioning room
Anyhow, most slim version run less hot, due to better design overtime and reduction in power draw because of reduced die size.
Most hardware issues occur from first production runs as well, due to lack of long term testing, but typically also better QC though, as cheaper components start being availability.
The only way first gen price go up in history of consoles is hacking, which normally happens at a hardware level until a fix is f Sg one so first few months or year is hackable the price will go up.