The toughest day of the work week, as many of us know, is Monday. That seemed to be true for Twitter, as well, as the online social networking/microblogging service endured several technical glitches that left some users without updated streams and other problems.

The site was unavailable for 25 minutes to an unknown number of users just after 1 pm Pacific Daylight Time Twitter confirmed via a post on its status blog. The troubles, including a delay on tweets, stretched until about 2 pm.

An “erroneous change” caused the issue, which it rolled back and corrected, according to the company. Twitter didn’t elaborate on the situation, according to reports.

The main feed, “connect” and “discover” tabs were affected on desktop and some mobile versions. Most recent mentions were also not displayed on IOS and the search function was inoperable for other users.

Twitter has endured some rocky times since January with more than 10 site issues of varying degrees. Monday’s issues reportedly stemmed from the company’s attempt to update software live, something Microsoft dealt with in March as well. One of that company’s webmail services endured a two-day outage following a firmware update of its data centers.

Some of Twitter’s challenges can be chalked up to growing pains, as changes in April allowed it to support three new types of mobile content in expanded tweets: mobile apps, photo galleries and product listings.

Twitter CEO Dick Costolo, meanwhile, said the company is focused on its “relationship” with television and not the buzz over its potential initial public offering. Keeping things simple is the key to Twitter’s success, Costolo told All Things Digital in an interview.

“I’ll use a sports metaphor. I feel like I’m this wide receiver and I’m running down the sidelines and I’m trying to manage this business and I’m trying to create separation from the cornerback, and the quarterback’s throwing the pass and I’ve got to figure out how I’m going to catch the ball, and this person on the sidelines says, ‘Hey, what are you doing after the game?’ I stop and say, ‘I’m not thinking about that right now,’ and they’re like, ‘Oh, sure.’ I’m trying to run this business and build this business. [An IPO] isn’t what I spend a lot of time thinking about.,” Costolo said.

Twitter’s numbers are enormous and impressive, as the company boasts over 200 million monthly active users with more than 400 million tweets sent per day.