I browsed around but couldn't a fix to my problem , My site

Hello I browsed around but couldn't a fix to my problem ,

My site http://construyotucasa.com/ is super slow also the main site http://redboricua.com

I use to have many plugins but I delete most of them, i use autoblog but I turned off. The site keeps dropping of many times. I use jetpack to monitor http://dialogoboricua.com so I know when the site drops.

I just installed W3 Total Cache but no luck?

Thanks in advance!