Key Points:

• Volvo promises software improvements for buggy EX90 SUV .
• The automaker is investing in its Charleston plant to boost production by 50 percent in the US over five years .
• The three-row SUV was supposed to usher in a new era of electrified dominance for the Chinese-owned, Swedish-owned automaker .
• Volvo promises software improvements for buggy EX90 SUV