What happened to RadioShack?

Can you explain what led to the downfall of RadioShack, a once-dominant electronics retailer? Was it due to the rise of online shopping and the decline of physical stores, or were there other factors at play, such as mismanagement or an inability to adapt to changing consumer preferences? Additionally, how did the company's financial struggles and bankruptcy filings contribute to its eventual demise, and what can be learned from RadioShack's struggles to inform the future of retail?