|Your 'charger' is really a power supply, there are two other components that might be causing the problem, one more likely than the other. |
First, the charging jack on the machine sometimes goes bad, sometimes it is rough handling, sometimes it simply looses contact or has intermittent contact due to loss of tension in the spring like components of it.
Second is less likely, but the charging circuit is actually within the laptop/machine and it could have gone bad.
Then od course, if you are purchasing cheap rejects shipped from China or sold from China to a local source, they probably are not up to mfg's standards and could be bad or failing months after beginning to use them.
You have to be a little bit crazy to keep you from going insane.