A major broadband outage on Tuesday April 21st left 10,000 Tesco broadband customers without access to the internet.
The supermarket chain launched an investigation into the problem, which started at midday, and was still looking to restore connectivity at 5:30pm.
Broadband subscribers in various parts of the UK were affected by the outage, with roughly one in seven Tesco customers losing internet services.
The broadband provider said the issue was not related to the migration of customers to TalkTalk's network.
Earlier in the year, it was announced that TalkTalk had bought Tesco's broadband and line rental business, as the retail giant steps away from communication services.
This will see 75,000 customers move to TalkTalk later this year, unless they opt to switch to another broadband provider.
Tesco gave an update on Tuesday evening via its Twitter feed, saying it was liaising with its network partner to resolve the issue as quickly as possible.
"[We] apologise to any customers affected for the inconvenience," the service provider stated.
The BBC noted that this is the tenth network failure this month, with customers in London, the south-east of England, and in the West Midlands having all suffered outages in the last two weeks.
However, a spokesperson for Tesco told the BBC that the operator's fault rate is in line with the UK telecoms industry average, noting that the firm has "high customer satisfaction ratings".
"Tesco broadband uses its Twitter feed to update customers on all network outages as our customers have told us they find this very helpful," the representative stated.
"This means that we report on any network problem even if just a handful of customers are experiencing issues."
The latest broadband outage couldn't have come at a worse time for Tesco, with the company announcing record losses of £6.4 billion on Wednesday morning.