I hate appear ignorant, but what are you referring to when you say "jailbreak"?? I have the original iPad............It seems like lately when I am playing Candy Crush it doesn't "crash", per se, but will go back to the "home" screen. I suppose technically it IS crashing. Any suggestions?
Your iPad is crashing because of a lack of ram. As Scifan has said the iPad 1 has only 256mb of ram compared to the ipad2 which has 512mb and the newer iPads which have 1 GB of ram. As apps are only getting bigger with advancing technology the iPad 1 will continue to struggle more and more to keep up. Any sites you may visit through Safari which are graphic intensive will cause crashes also.
There are some steps you can take which will limit this happening as much and these steps will also free up ram.
Limit your location services to the apps you are using now.
Close apps regularly (all apps in your multi task bar are using some ram, even though they are not running and closing them completely will free up this ram) - From the home screen do the four finger swipe up or double press the home button to reveal your multi task bar. Long press an app until it jiggles and a red minus sign will appear above it. Press the minus sign, this will close the app, not delete it, now press the home button to return to your home screen
Go to Settings - Safari and Clear your History and also Clear your Cookies and Data. Safari retains bits of info from every site you visit.....if you would like to have a look first before clearing your History etc. go to Settings - Safari - Advanced - Website Data - Show All Sites.
After doing this, it would be a good idea to do a reset of your iPad just to allow everything to settle in nicely. Apple have now ceased updates for the iPad 1 as it is really quite old now in technology terms and although it will still continue to be a great device for certain tasks, it may be time to upgrade to a newer iPad!
Reset - Hold the power off button and the home button simultaneously, keep holding them in and you may see the power off slide appear and disappear, wait until you see the Apple logo appear before releasing the buttons. It will take a little longer for your iPad to start.
I do hope these steps help you.