Cherry Mobile Flare S Play Mediatek 6592 chipset (Philippines) Unit Issues

Phone Tech Specs:
5.0-Inch HD Display (720 x 1280 Pixels, 294 ppi)
Android 5.1 Lollipop OS
1.4GHz Octa Core Processor
2GB of RAM
13.0 Megapixel Autofocus Main Camera with LED Flash
5.0 Megapixel Front Camera
16GB Internal Storage
Expandable Up to 32GB via MicroSD
Dual SIM
4G LTE, 3G HSPA+, 2G EDGE and GPRS Networks
Wi-Fi and Wi-Fi Hotspot
Digital TV
Bluetooth 4.0
FM Radio
MicroUSB 2.0
3.5mm Audio Jack
Proximity Sensor
Ambient Light Sensor
2,000mAh Li-ion Battery

Good day, I have some problems with my unit specified in the title. I posted the specifications above as well.

Problems encountered on the said unit:
Slow wifi, barely getting 1 mbps both on upload and download no matter how good the internet is
Two bars wifi signal only even though the unit is beside the model already
Wireless hotspot can't be detected by other devices, whereas wired tethering works fine
Sensors are not detected by the cpu z (for example, the rotation function is not working, display always stay in portrait even though auto-rotate was selected)
High cpu usage even though there aren't any apps running in the background (All cores at full mhz, 100% cpu load) thus resulting to high temperature
Screen display will show cracked lines then phone will turn itself off again (happens usually when I turn on the mobile data), sometimes I can still turn it back on, sometimes I need to flash a new os to it.

Troubleshooting I've tried so far:
Hard reset and reflashing
Updating firmware

That's the summary of the issues I encountered, and haven't been resolved for the past three months as I don't have much time to tinker with the phone and am using my backup phone for the time being, though right now my backup phone is also showing some tell-tale signs of breaking down. Anyway, no matter how many times I try to reflash my unit, the issues above are recurring. I'm not sure if there are anything else I can do before bringing it to a cellphone technician to be assessed properly, albeit saving time and money also.

Could this be on the hardware already? Or I might have missed out other troubleshooting steps that cover firmware? Please enlighten me, and I know I'm not very good with the English language, so if there's something that can't be understood on what I've stated above, don't hesitate to point it out to me. All inputs are highly appreciated. Thank you in advance admin and to those who will provide their inputs!

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