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multiple issues can cause this. the first is an aftermarket protective case, the second is continuously overcharging it. the third is program(s) running in the background that will not shut down. The battery may be damaged as well. Step one is reconditioning the battery. run it until it is dead, recharge it until it is JUST charged full and disconnect the charger and run until dead again. This should eventually increase the time between the need for recharging if the battery isn't damaged. If it has an after market case remove it while doing this. If it is an android, download a handful of utilities from CM (free) starting with their Battery Doctor and their antivirus ( they are the best known and respected android developers) and run them. you can do this while you are conditioning the battery.
Battery Doctor will take over for the other apps that are telling you the tablet is overheating. and will automate the process of taking care of whatever is causing problems.
I use them on my Tablet and my Samsung Smart phone
Are you actually turning the tablet off when you are not using it? (Hold down power button until Power Off box appears on screen)? If not, your tablet is constantly using power even with the screen blanked and will drain the battery. You could have a bad battery that is no longer holding its charge. How long can you run the device off the charger continuously? That length of time might indicate the state of the battery. Check the manual for expected battery life, which for a Linx 7 is usually 4 hours or less.
Usually mobile devices such as smartphones and tablets have built in sensors which by factory are set to adjust brightness depending on lighting conditions on your room in order to preserve battery life.
On android devices you can deactivate this feature going to Settings - Display - Brightness - remove check from "Adapt to lighting conditions"
Hold down power button until shuts off. If freezing continues then has a virus. Go to app store and download avast and do a full system scan. If can't do that then do a factory reset. Back up everything on computer first. Hold down home button, power button and volume down at the same time when powered off. After boot screen release only the power button. When a screen loads use volume keys to navigate to factory restore and press power button then wait till done. If volume down doesn't work then use volume up instead.
Your tablet may need its battery calibrating. To do this run your tablet until it turns itself off, this will ensure that there is no charge left in the battery. Then leave it on charge until the battery is full. Normal battery use on modern devices like tablets and phones should be between 25-75%, with a calibration once every 3-6 months to ensure a good battery lifespan. If this solution does not work you may need to replace the battery.
The charger has a function that restores the battery operation parameters by discharging then charging the battery a number of times. Refer to charging instructions in the pack but I think the cycle is a 3 hourly one, time to charge from a full discharge. If the charger thinks the battery is dead then it will try to recover the battery using this process. You may have left the charger on long enough to charge then also discharge the battery.
Start again and charge for the time in the instructions ONLY, if you are not sure of the time try it for an hour, then without disconnecting the charger turn the unit on and take particular note of any screen messages, if any.
You should be able to continue as normal now, but still be aware of the time you are leaving the charger connected for, as it may take some time before it returns to normal operation and stops trying to recover what it thinks is a dead battery.
Have you tried plugging it into the charger? If it's plugged in, the screen should dim but not turn completely off for at least 10 seconds. If it doesn't work, try covering the light sensor on the front of the tablet, so that the screen will brighten until you can change the backlight setting in Menu -> Settings -> Display.