Why did RadioShack fail?

Can you explain in detail why RadioShack, a once-prominent electronics retailer, ultimately failed? Was it due to a lack of adaptability to the changing retail landscape, such as the rise of online shopping? Did they fail to invest in new technologies or diversify their product offerings? Or was it a combination of factors, including poor management decisions and financial missteps? I'm eager to understand the underlying reasons behind this company's downfall.