Update = After verifying ownership and completing troubleshooting, a DELL agent set in motion a like for like system exchange.
Bought this laptop for £1000 a year ago, fan started going off and it was overheating. Dell took it away to replace the heat sync I think but instead I got back what was a complete rebuild. One-two months later the same thing has happened again. All I use this laptop for is browsing, web conferencing and coursework so Adobe Acrobat Reader and MS Word and maybe MS Powerpoint will also be open at the same time. The other day it happened when I was having a meeting with Google Meet. Completely ruined my meeting. This spec of laptop should have no issues with these apps. It has is a very thin design and reading some older posts makes me think this is a design flaw. Thankfully I purchased the extended warranty but I do not want another rebuild. I'll be honest I am sick of this and I should not have to put up with this and I should not have needed to purchase the extended warranty. The laptop is treated with so much care. I even elevate it so it has adequate ventilation but I think everything is down to a design flaw.  Would appreciate anybody's advice, knowledge and expertise. Thanks
Inspiron 15 7000 Series - 7501 - overheating and fan constantly on