Lotus deputy team principal Federico Gastaldi says failing to finish the Canadian GP "hurt" as once again the team failed to fulfill their potential.
Romain Grosjean retired from the Montreal race when his rear wing failed while Pastor Maldonado's efforts were undone by a problem with his Renault engine.
With both cars out of the running, Lotus recorded zero points for the fifth time in seven races.
"We have potential which is still to be fulfilled," lamented Gastaldi. "Canada was a kick where it hurts for everyone at the team but we took stock, identified the issues and have taken action to avoid any repeats.
"The last thing you want is both cars sat in the garage at the end of a race, but that's what we had. Thankfully it is very rare for us. A rear wing issue for Romain was something unforeseen. We've analysed what went wrong, found a fix and it won't happen again.
"A power unit issue for Pastor was not something new so we're spending more time with Renault Sport F1 to do everything possible to avoid a repeat of this. It was an issue with a power unit sensor. Just a small thing, but something that had terminal repercussions."
Staying on eight points and eighth in the Championship, Gastaldi believes it is still too early to judge the team and especially not on their early season results.
"It's a difficult question," he said when asked about Lotus' position in the current order. "We are only seven races in to the biggest rule changes we have seen for a generation so we're all finding our place. Certainly, we're learning a lot.
"I don't think it's fair to judge us purely on our results so far this year, and fortunately the championship is 19 races long.
"Monaco and Montréal were both races which didn't play to our strengths and additionally we had reliability problems at both of them. Austria looks to be more positive in terms of its potential for us, as well as the next few races too.
"We're making improvements all the time so we can tackle all the aspects which cause us a challenge."