Question: I have two Galaxy Tab S2 tablet computers that continuously turn themselves on and off.

I’ve tried many suggested solutions, including charging the battery, pressing the power and “volume up” buttons at the same time and removing the tablet’s cover (which contains a magnet.)

A technician suggested that the tablets’ circuit boards might be causing the problem. What can I do? — J.E., Chippewa Falls, Wis.

Answer: This problem is familiar to many owners of the Galaxy Tab S2, and usually is caused by the device’s battery. (It’s unlikely that both of your tablets have flawed circuit boards.)

The most effective solution appears to be temporarily disconnecting the tablet’s battery, either physically or electronically. There’s disagreement about exactly why that works, but there’s apparently some benefit in draining the electrical charge from tablet components.

Physically disconnecting the battery is a slow process that requires small tools. This battery-replacement video (see tinyurl.com/y49wjoa7) shows how to disconnect one (you don’t need to remove).

A simpler method is to use the Galaxy Tab S2’s “soft reset” feature, which simulates disconnecting the battery. Hold down both the power (on-off) button and the “volume down” keys for about 45 seconds. This reset won’t cause any loss of data.

If disconnecting the battery doesn’t help, try clearing the tablet’s cache memory (see solution two at tinyurl.com/y2btlf4n) or returning the device to its factory settings (see “Master reset with hardware keys” at tinyurl.com/y6nkspap).

Note that the “master reset” will erase data stored in the tablet’s memory, but won’t affect data stored on either the tablet’s SIM card (which connects a tablet to a wireless phone network) or its removable memory card.

Question: The hard disk on my Windows 7 PC is filling up, even though I download little data. In a recent 10-day period, the available hard disk storage dropped by 13.5 gigabytes. As a result, I have only 19 gigabytes of available space left on my 1 terabyte (1,000 gigabyte) hard drive. My antivirus and Malwarebytes programs report no problems. What should I do? — M.J., Plymouth, Minn.

Answer: You should check for several possible causes, such as malware, programs that save too much data or flaws in the software that monitors available disk space. Try these methods:

Make sure you are getting reliable information about potential malware activity. Restart your PC in “safe mode,” run scans with your antivirus program and Malwarebytes, then restart the PC. (To enter safe mode, press the F8 key regularly as the PC starts up. In the resulting menu, choose either “safe mode” or “safe mode with networking.” Press the “enter” key.)

See whether your PC’s programs are storing too much unneeded data. Run the Windows “disk cleanup,” program, which will list “temporary or cached” files, and tell you how much disk space could be saved by deleting them (see “Temporary and cached files” at tinyurl.com/y3uvbd6j).

Find out whether the software that monitors your hard disk is flawed. That could cause it to incorrectly report a shortage of hard disk space. Run a Windows program called “chkdsk” (check disk.) See “file system corruption” at the same Web address.

Alexander covers technology for the Minneapolis Star Tribune. Readers can write to him at Tech Q&A, 425 Portland Ave. S., Minneapolis, Minn. 55488-0002; email: steve.j.alexander@gmail.com. Include a full name, city and phone number.

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