Crash in calculator

[math7]

I deleted all the applications and programs that were installed on the calculator and restored with the reset button and tried by creating a new program and the calculator was not crash. Then I thought I had solved the problem but no. I discovered that the calculator is reset when creating two programs. For example, I make a new program with the program editor and I put a name as Prog1 and left it without instructions and I give it ok and no problem, but when doing a second program either, I enter the name and I give ok and the Calculator is reset, it is very strange. In addition to this, in the Home mode there are some values ​​for real variables, and with no command I can delete those values, for example the variable X had a value of 2,785 .... and I write DelHVars (X) and I give enter and it puts 0 But if I type X on the command line and hit enter it comes out again with its value of 2,785; The only way is to enter with the keys Shift + Mem and from there reset one by one each variable which is very tedious, there should be a command to do it once and for all.