From your description, it appears that there must be something wrong with the device’s motherboard. The processor on the motherboard has most likely been damaged in some way, thus reducing its speed. Unfortunately, the processor cannot be replaced without replacing the whole motherboard. Therefore, it looks like the only way to fix your problem is by removing the device’s motherboard and reinstalling a brand new one. For more information on this problem and further details on how to fix it please see the troubleshooting page.

Sounds like you might have a combination of problems. Headphones most often get static if the headphone jack becomes dirty. In this case, a can of air can be used to blow out any debris and improve the sound quality. The other possibility is that your headphones are faulty in some way. Try plugging them into another device and see if there is still static. If so, you might need a new pair of headphones. As far as the external speakers go the most likely cause of your problem is a blown speaker, being as the left speaker often cuts out and stops working. It sounds like the left speaker is the culprit of your reduced sound quality. On the other hand the sound card on the device’s motherboard might have been damaged in some way. In these cases, either the speaker or the motherboard will have to be replaced. For more information on these problems and how to fix them please see the troubleshooting page.

The most likely cause of this problem is that your battery is no longer working properly. Batteries have a limited number of charging cycles and in all likelihood yours has reached its limit. Another possibility is that the device’s motherboard has been damaged in some way. The motherboard is responsible for booting up the device and monitoring battery charging cycles. If it’s damaged just about anything can go wrong. In either case something has to be replaced. Please see the troubleshooting page for further details.