It is good, if you can get a new one mate.

If the budget is an issue, just get the restarting problem fixed, upgrade the ram to 8gb (if it supports upgrading) and also get an ssd instead of the hdd(if you have a slot for an additional hard disk, you can keep the old one as well).

Probably try to get an entry level gaming laptop with a H processor and with 16/32gb RAM. Just make sure the ram (2 slots) and ssd (has an additional slot for extra one) are upgradable. Lenovo,MSI or Asus entry level gaming laptop will suite you. Just go with a brand and model commonly available in your country,so that if something goes wrong the part cost will be less. (All these are electric devices, so sometimes unexpected things can happen know).

Specs do show such information for laptops in manufacture websites mate.

For example msi gf Thin GF63 12UDX (exact model);

STORAGE CAPABILITY 1x M.2 SSD slot (NVMe PCIe Gen4) 1x 2.5" SATA HDD

MEMORY Max 64GB DDR4-3200 2 Slots

That is normal bro. If it is around 90 only you need to worry.

Just check the model specs. If it does not include a slot for standard ssd, then you can use the ssd via usb (just get an ssd 2.5 enclosure and put the ssd in it )

If it is within warranty you can take it to the place you bought it. They will either fix (if is a minor issue) or you will be able to claim warranty (if the device is a faulty one)

Zenbook is the best option considering the specs. Thinkpad is an excellent option as well. You can choose one of the two.

Good one for that price mate

Issue is with the battery. Do a full charge and see, if it is rapidly droping. Then probably get it replaced as you may still have warranty.