Complaint letter to a shop

Would you please review my complaint letter :

You work at home and have a problem with a piece of equipment that you use for your job,

Write a letter to the shop or company which supplied the equipment.
In your letter :

- Describe the problem with the equipment.
- Explain how this problem is affecting your work.
- Say what you want the shop or company to do.

My Letter :

Dear Sir,

I'm writing to express my dissatisfaction with my laptop , which has been purchased from your shop last week,

The laptop was working perfectly during the first two days , but unfortunately , Its performance started dropping and I was experiencing several glitches and freezes. I couldn't use it again unless I restart it, Additionally , a blue line appear on the screen every time I turn on the laptop, It stays for 1 hour then disappear.

This is extremely annoying and disturbing , As I use my laptop for work, Now every time I have to save my work in case it happens again otherwise I will lose all my work progress.
Because of these reoccurring issues, I'm now late to submit four days of work, which put me in a very delicate situation with my boss .

Would you please take the necessary actions to fix my laptop, or change it with a new one since the product is still within warranty period, I'm looking forward to hearing from you.

Regards